ext上传文件到mysql上

不废话，上代码：

controller如下：

/**
     * 上传附件
     * @param request
     * @param baseBlob
     * @param response
     */
    @RequestMapping(value="/uploadSeal",method=RequestMethod.POST)
    @ResponseBody
    public void addBaseBlob(HttpServletRequest request,Seal seal,HttpServletResponse response,@RequestParam(required=false) String sealId){
        int flag=0;
        try {
            request.setCharacterEncoding("utf-8");
        } catch (UnsupportedEncodingException e1) {
            e1.printStackTrace();
        }
        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest)request;
        MultipartFile multipartFile = multipartRequest.getFile("file");
        
         // 上传的文件名 //需要保存
        String uploadFileName = multipartFile.getOriginalFilename();
        // 获取文件后缀名 //需要保存
        String fileType = StringUtils.substringAfterLast(uploadFileName, ".");
        if("PNG".equalsIgnoreCase(fileType)||"JPEG".equalsIgnoreCase(fileType)||"JPG".equalsIgnoreCase(fileType)){
            if(multipartFile!=null&&!"".equals(multipartFile.getName())){
                File file = new File(request.getSession().getServletContext()
                        .getRealPath("WEB-INF"+File.separator+"upload"), multipartFile.getOriginalFilename());
                // 判断文件夹是否存在，不存在则创建
                if (!file.getParentFile().exists()) {
                    file.getParentFile().mkdirs();
                }
                try {
                    String userId=request.getParameter("userId");
                    FileUtils.copyInputStreamToFile(multipartFile.getInputStream(), file);
                    seal.setUpdateUser(((BaseUsers)request.getSession().getAttribute(WebConstants.CURRENT_USER)).getUserId());
                    seal.setUpdateTime(new Date());
                    seal.setSealImage(FileDigest.getBytesFromFile(file));
                    if(StringUtils.isNotBlank(sealId)){
                        seal.setId(sealId);
                        flag = sealService.update(seal);
                    }else{
                        flag=sealService.insert(seal);
                    }
                    
                } catch (IOException e) {
                    e.printStackTrace();
                    flag=0;
                }finally{
                    file.delete();
                }
            }
            
            response.setContentType("text/html;charset=utf-8;");
            try {
                if(flag==1)
                    response.getWriter().write("{success:true,msg:""+seal.getId()+""}");
                else
                    response.getWriter().write("{success:false,msg:"上传失败！"}");
            } catch (IOException e) {
                e.printStackTrace();
            }finally{
                
                try {
                    response.getWriter().flush();
                    response.getWriter().close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }else{
            response.setContentType("text/html;charset=utf-8;");
            try {
                response.getWriter().write("{success:false,msg:"格式不正确！"}");
                response.getWriter().flush();
                response.getWriter().close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

前台ext如下：

Ext.ns('Ext.seal')
Ext.seal.SealUploadWindow = Ext.extend(Ext.Window, {
            
            store : null,
            /* 保存路径 */
            uploadUrl : null,
            //grid : null,
            title : '上传印章',
            constructor : function(_config) {
                Ext.apply(this, _config || {});
                this.myform = new Ext.FormPanel({
                            fileUpload : true, // 默认为图片上传
                            id : Ext.id(),
                            baseCls : 'x-plain',// 基本效果为纯色效果
                            bodyStyle : 'padding-top:10px;padding-left:0px;',
                            closealbe : true,
                            // 里面组件的布局方式
                            // layout : 'fit',
                            height : 400,
                            items : [{
                                        labeWidth : 80,
                                        xtype : 'textfield',
                                        name : 'file',
                                        inputType : 'file',
                                        allowBlank : false,
                                        width : 200,
                                        fieldLabel : '上传印章'
                                    },{
                                            xtype : 'textfield',
                                            name : 'sealId',
                                            hidden : true
                                        }]
                        });
                this.url = {
                    uploadUrl : ctx+'/seal/uploadSeal'
                }

                Ext.seal.SealUploadWindow.superclass.constructor.call(this, {
                            width : 350,
                            height : 150,
                            title : '上传印章',
                            frame : true,
                            // 可以关闭
                            closable : true,
                            // 关闭 按钮 销毁 窗口并销毁所以子控件。这使得Window对象和它的子控件不可 复用.
                            // 如果想复用Window, 设置
                            closeAction: 'hide' ,
                            //closeAction : 'close',
                            // 打开window页面在window页面加了个遮罩层
                            modal : true,
                            // 纯色效果
                            plain : true,
                            // 里面组件的布局方式
                            layout : 'fit',
                            items : [this.myform],
                            buttons : [{
                                        text : '上传印章',
                                        scope : this,
                                        handler : this.uploadPhoto
                                    }, {
                                        text : '重置印章',
                                        scope : this,
                                        handler : function() {
                                            this.myform.getForm().reset();
                                        }
                                    }, {
                                        text : '关闭',
                                        iconCls:'cancel',
                                        scope : this,
                                        handler : function() {
                                            this.hide();

                                        }
                                    }]
                        });

            },

            // 提交表单
            uploadPhoto : function() {
                if (this.myform.getForm().isValid()) {
                    this.myform.getForm().submit({
                        url : this.url.uploadUrl,
                        method : 'post',
                        waitMsg : '印章上传中...',
                        scope : this,
                        success : function(form,  action) {
                            Ext.Msg.alert('提示', '上传成功！', function() {
                                var sealId = action.result.msg;
                                this.myform.getForm().findField('sealId').setValue(sealId); 
                                this.hide();
                                
                                    }, this);
                        },
                        failure : function(form, action) {
                            Ext.Msg.alert('提示', action.result.msg, function() {
                                    }, this);
                        }
                    });
                }
            }

        });

formpanel：

Ext.ns('Ext.seal');
Ext.seal.SealFormPanel = new Ext.extend(Ext.form.FormPanel, {
    sealId:null,
    constructor : function(_config) {
        if (_config == null) {
            _config = {};
        }
        this.imgBox = new Ext.BoxComponent({
            xtype : 'box',
            id : 'browseImage',
            name : 'photopath',
            anchor : '20%',
            height : 120,
            width : 240,
            autoEl : {
                tag : 'img',
                src : '',
                style : 'filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale);',
                complete : 'off'
            }
        });
        this.store = new Ext.data.Store();
        this.tempID = Ext.id();
        this.labeID = Ext.id();

        Ext.apply(this, _config);
        this.contentPanelId = Ext.id();
        Ext.seal.SealFormPanel.superclass.constructor.call(this, {
                    labelWidth : 80,
                    frame : true,
                    border : false,
                    bodyStyle : 'border:0px;',
                    defaults : {
                        bodyStyle : 'border:0px;',
                        width : 560

                    },
                    items : [{
                        layout : 'column',
                        xtype : 'fieldset',
                        title : '详细信息',
                        items : [{
                            columnWidth : .5,
                            defaults : {
                                // 设置默认类型
                                xtype : 'textfield',
                                // 自动调整宽度
                                anchor : '90%',
                                disabledClass : 'txtDisabled'
                            },
                            layout : 'form',
                            autoHeight : true,
                            // 分栏中的元素
                            items : [{
                                name : 'id',
                                xtype : 'textfield',
                                hidden : true
                            }, {
                                fieldLabel : '印章名称',
                                xtype : 'textfield',
                                name : 'sealName',
                                allowBlank : false,
                                blankText : '请输入印章名称'
                            }, {
                                fieldLabel : '备注',
                                xtype : 'textarea',
                                name : 'remark'
                            },{
                                xtype:'hidden',
                                name:'sealId'
                            }]
                        }, {
                            columnWidth : .5,
                            defaults : {
                                // 设置默认类型
                                xtype : 'textfield',
                                // 自动调整宽度
                                anchor : '90%',
                                disabledClass : 'txtDisabled'
                            },
                            layout : 'form',
                            autoHeight : true,
                            style : 'margin-left:20px',
                            // 分栏中的元素
                            items : [this.imgBox,{
                                xtype : 'button',
                                text : '上传印章',
                                allowBlank : false,
                                anchor : '20%',
                                scope:this,
                                handler : this.uploadWindow
                            }]
                        }]
                    }],
//                    items : [this.imgBox,{
//                                xtype : 'button',
//                                text : '上传印章',
//                                allowBlank : false,
//                                anchor : '20%',
//                                scope:this,
//                                handler : this.uploadWindow
//                            },{
//                                name : 'id',
//                                xtype : 'textfield',
//                                hidden : true
//                            }, {
//                                fieldLabel : '印章名称',
//                                xtype : 'textfield',
//                                name : 'sealName',
//                                allowBlank : false,
//                                blankText : '请输入印章名称'
//                            }, {
//                                fieldLabel : '备注',
//                                xtype : 'textarea',
//                                name : 'remark'
//                            },{
//                                xtype:'hidden',
//                                name:'sealId'
//                            }
//                    ]
                });
    },
    uploadWindow : function (){
        if (this.myUploadWin == null) {
            this.myUploadWin = new Ext.seal.SealUploadWindow({
            });
            
        }
        this.myUploadWin.on('show', function(win) {
            win.myform.getForm().reset();
            if(this.sealId){
                win.myform.getForm().findField('sealId').setValue(this.sealId);
            }
        }, 
        this);
        this.myUploadWin.show();
        this.myUploadWin.on('hide', function(win) {
            var sealId2 = win.myform.getForm().findField('sealId').getValue();
            this.getForm().findField('sealId').setValue(sealId2);
            Ext.getCmp('browseImage').getEl().dom.src=ctx+"/seal/download?sealId="+sealId2+"&thisTime="+Date.parse(new Date());
            
            }, 
            this);
    }
})

winpanel：

Ext.ns('Ext.seal');
Ext.seal.SealWin = Ext.extend(Ext.Window, {
            store : null,
            saveUrl : null,
            sealId:null,
            constructor : function(config) {
                if (config == null) {
                    config = {}
                }
                Ext.apply(this, config);
                
                this.formPanel = new Ext.seal.SealFormPanel({
                    sealId:this.sealId
                });
                
                Ext.seal.SealWin.superclass.constructor.call(this,
                        {
                            width : 600,
                            height : 280,
                            closeAction : 'hide',
                            plain : true,
                            modal : true,
                            resizable : true,
                            layout:'fit',
                            items : [this.formPanel],
                            buttons : [{
                                        text : '保存',
                                        scope : this,
                                        handler : this.save
                                    }, {
                                        text : '重置',
                                        scope : this,
                                        handler : this.reset
                                    }]
                        });
            },
            save : function() {
                var form = this.formPanel.getForm();
                var sealId = form
                if (!form.isValid()) {
                    return;
                }
                // 发送请求
                this.formPanel.getForm().submit({
                            url : this.saveUrl,
                            method:'post',
                            success : function(form,action) {
                                Ext.MessageBox.alert('提示',action.result.msg,function(){
                                   this.store.reload();
                                   this.hide();
                                },this);
                            },
                            scope:this
                        });
            },
            loadRecord : function(record) {
                this.formPanel.getForm().loadRecord(record);
            },
            reset : function() {
                this.formPanel.getForm().reset();
            }
        });

GridPanel：

Ext.ns('Ext.seal');
Ext.seal.SealGridPanel= Ext.extend(Ext.grid.GridPanel, {
    actionJson : null,
    pageSize : 20,
    constructor : function(_config) {
        Ext.apply(this, _config || {});
        this.Url = {
            allUrl : ctx + '/seal/queryListForPage',
            insertUrl : ctx + '/seal/insert',
            deleteUrl : ctx + '/seal/delete',
            updateUrl : ctx + '/seal/update',
            findByIdUrl:ctx + '/seal/getSeal',
            isEnableOrNot:ctx + '/seal/isEnableOrNot'
            
        };
        /** 顶部工具栏 */
        this.actionToolBar = new Ext.Toolbar({
            items:[new Ext.Action({
                text : '新增',
                scope:this,
                handler : this.addWindow
            }),'-',new Ext.Action({
                text : '修改',
                scope:this,
                handler : this.modifyWindow
            }),'-',new Ext.Action({
                text : '删除',
                scope:this,
                handler : this.deleteWindow
            }),'-',new Ext.Action({
                text:'启用',
                scope:this,
                handler:this.isEnableTrue
            }),'-',new Ext.Action({
                text:'停用',
                scope:this,
                handler:this.isEnableFalse
            })]
        });
        /** 顶部工具栏*/
//        this.actionToolBar = new Ext.ActionToolbar({
//            actionPanel : this,
//            actionJson : this.actionJson,
//            deleteFunction : this.deleteWindow,
//            addFunction : this.addWindow,
//            editFunction : this.modifyWindow
//
//        });
        this.store = new Ext.data.JsonStore({
                    baseParams : {
                        start : 0,
                        limit : this.pageSize
                    },
                    url : this.Url.allUrl,
                    root : 'rows', // Json中的列表数据根节点
                    totalProperty : 'results',
                    fields : ['id', 'updateUser', 'realName','sealName','remark','isEnable','sealImage',{
                                name : 'updateTime',
                                type : 'date',
                                dateFormat : 'time'
                            }]
                });
        /** 基本信息-选择模式 */
        this.selModel = new Ext.grid.CheckboxSelectionModel({
                singleSelect:true,
//                listeners : {
//
//                    'rowselect' : function(selectionModel, rowIndex, record) {
//                        this.actionToolBar.enableEditDelete();
//                    },
//                    'rowdeselect' : function(selectionModel, rowIndex,
//                            record) {
//                        if (!selectionModel.hasSelection()) {
//                            this.actionToolBar.disableEditDelete();
//                        }
//                    },
//                    scope : this
//                }
                });
        this.colModel = new Ext.grid.ColumnModel([this.selModel,{
                    header : '主键',
                    dataIndex : 'id',
                    hidden : true
                },{
                    header : '印章名称',
                    dataIndex : 'sealName',
                    width : 150
                },{
                    header : '启用/停用',
                    dataIndex : 'isEnable',
                    width : 150,
                    renderer:function(value){
                        if(value==1){
                            return "启用";
                        }else if(value==0){
                            return "停用";
                        }
                        return value;
                    }
                },{
                    header : '修改人',
                    dataIndex : 'realName',
                    width : 150
                },{
                    header : '修改时间',
                    dataIndex : 'updateTime',
                    width : 150,
                    renderer : Ext.util.Format.dateRenderer('Y-m-d H:i:s')
                },{
                    header : '备注',
                    dataIndex : 'remark',
                    width : 150
                },{
                    header : '印章',
                    dataIndex : 'sealImg',
                    200,
                    renderer:function(value,metc,record){
                        return "<img src="+ctx+"/seal/download?sealId="+record.data.id+"&thisTime="+Date.parse(new Date())+" />";
                        //return ctx+"/seal/download?sealId="+record.data.id;
                    }
                }]);
        this.bbar = new Ext.PagingToolbar({
                    pageSize : this.pageSize,
                    store : this.store,
                    displayInfo : true
                });
        Ext.seal.SealGridPanel.superclass.constructor.call(this, {
                    store : this.store,
                    cm : this.colModel,
                    sm : this.selModel,
                    tbar : this.actionToolBar,
                    bbar : this.bbar,
                    loadMask : true
        });
        
        this.on('rowdblclick', this.readSeal, this);
        
        this.store.load();
    },
    addWindow : function() {
        var record = this.getSelectionModel().getSelected();
        if (this.addWin == null) {
            this.addWin = new Ext.seal.SealWin({
                saveUrl : this.Url.insertUrl,
                store : this.store
            });
            this.addWin.setTitle("新增印章");
        }
        this.addWin.reset();
        this.addWin.show();
        this.addWin.on('show', function(win) {
            Ext.getCmp('browseImage').getEl().dom.src='';
            }, 
            this);
    },
    modifyWindow : function() {
        var record = this.getSelectionModel().getSelected();
        if (record) {
            if (this.editWin == null) {
                this.editWin = new Ext.seal.SealWin({
                            saveUrl : this.Url.updateUrl,
                            store : this.store,
                            sealId:record.data.id
                        });
                this.editWin.setTitle("修改印章");
            }
            this.editWin.reset();
            this.editWin.show();
            this.editWin.on('show', function(win) {
                Ext.getCmp('browseImage').getEl().dom.src=ctx+"/seal/download?sealId="+record.data.id+"&thisTime="+Date.parse(new Date());
                }, 
                this);
            this.editWin.loadRecord(record);
            
        } else {
            Ext.MessageBox.alert('提示', '请选中一条记录!');
        }
        
    },
    deleteWindow : function() {
        /** 选中的记录 */
        var record = this.getSelectionModel().getSelected();
        if(!record){
            Ext.MessageBox.alert('提示', '请选中一条记录!');
            return;
        }
        Ext.MessageBox.confirm('提示', '您确定要删除选中记录吗？', function(btn) {
            if (btn == 'yes') {
                    Ext.Ajax.request({
                        url : this.Url.deleteUrl,
                        method : 'post',
                        params : {
                            id : record.data.id
                        },
                        success : function(response, options) {
                            var text = Ext.util.JSON.decode(response.responseText);
                            Ext.MessageBox.alert('提示', text.msg,function(){
                                if(text.success){
                                    this.store.reload();
                                }
                            },this);
                        },
                        failure : function(response, options) {
                            Ext.MessageBox.alert('提示', '请求失败！');
                        },
                        scope : this
                    });        
            }
        }, this);
    },
    /** 查看印章 */
    readSeal : function(grid, rowIndex, e) {
        var rec = grid.getStore().getAt(rowIndex);
        if (rec == undefined) {
            Ext.Msg.alert("提示", "每次只能且必须查看一条记录");
        } else {
            if (this.readWin == null) {
                this.readWin = new Ext.seal.SealReadWindow({
                            sealId:rec.data.id
                        });
                this.readWin.setTitle('查看详细');
            }
            this.readWin.show();
            Ext.Ajax.request({
                        url : this.Url.findByIdUrl,
                        method : 'post',
                        params : {
                            sealId : rec.data.id
                        },
                        success : function(response, opts) {
                            var content = Ext.decode(response.responseText);
                            this.readWin.loadSeal(content);
                        },
                        scope : this
                    });
        }
    },
    /**启用*/
    isEnableTrue:function(){
        var record = this.getSelectionModel().getSelected();
        if(!record){
            Ext.MessageBox.alert('提示', '请选中一条记录!');
            return;
        }else if(record.data.isEnable==1){
            Ext.MessageBox.alert('提示','选中行已经启用!');
            return;
        }
        Ext.Ajax.request({
            url : this.Url.isEnableOrNot,
            method : 'post',
            params : {
                id : record.data.id,
                isEnable:1
            },
            success : function(response, options) {
                var text = Ext.util.JSON.decode(response.responseText);
                Ext.MessageBox.alert('提示', text.msg,function(){
                    if(text.success){
                        this.store.reload();
                    }
                },this);
            },
            failure : function(response, options) {
                Ext.MessageBox.alert('提示', '请求失败！');
            },
            scope : this
        });    
    },
    /**停用*/
    isEnableFalse:function(){
        var record = this.getSelectionModel().getSelected();
        if(!record){
            Ext.MessageBox.alert('提示', '请选中一条记录!');
            return;
        }else if(record.data.isEnable==0){
            Ext.MessageBox.alert('提示','选中行已经停用!');
            return;
        }
        Ext.Ajax.request({
            url : this.Url.isEnableOrNot,
            method : 'post',
            params : {
                id : record.data.id,
                isEnable:0
            },
            success : function(response, options) {
                var text = Ext.util.JSON.decode(response.responseText);
                Ext.MessageBox.alert('提示', text.msg,function(){
                    if(text.success){
                        this.store.reload();
                    }
                },this);
            },
            failure : function(response, options) {
                Ext.MessageBox.alert('提示', '请求失败！');
            },
            scope : this
        });    
    }
});

extreturn实体类：

package cn.edu.hbcf.common.vo;
 
/**
 * Ext Ajax 返回对象
 * 
 * @author LiPenghui
 * @date 2012-02-21 19:30:00
 * 
 */

public class ExtReturn {

    private boolean success; // 是否成功
    private Object msg; // 返回消息
    private Object otherObject;// 其他对象

    public ExtReturn() {

    }

    /**
     * 是否更新成功的构造方法
     * 
     * @param success
     *            是否成功
     * @param msg
     *            消息
     */
    public ExtReturn(boolean success, Object msg) {
        this.success = success;
        this.msg = msg;
        this.otherObject = "";
    }

    /**
     * 是否更新成功的构造方法
     * 
     * @param success
     *            是否成功
     * @param msg
     *            消息
     * @param otherObject
     *            其他对象
     */
    public ExtReturn(boolean success, Object msg, Object otherObject) {
        this.success = success;
        this.msg = msg;
        this.otherObject = otherObject;
    }

    /**
     * 异常时的构造函数
     * 
     * @param errormsg
     *            异常消息
     */
    public ExtReturn(Object errormsg) {
        this.success = false;
        this.msg = false;
        this.otherObject = "";
    }

    /**
     * 判断是否成功
     * 
     * @return
     */
    public boolean isSuccess() {
        return success;
    }

    /**
     * 设置返回是否成功的状态
     * 
     * @param success
     */
    public void setSuccess(boolean success) {
        this.success = success;
    }

    /**
     * 设置其他对象
     * 
     * @return
     */
    public Object getOtherObject() {
        return otherObject;
    }

    /**
     * 获取其他对象
     * 
     * @param otherObject
     */
    public void setOtherObject(Object otherObject) {
        this.otherObject = otherObject;
    }

    /**
     * 获取返回的消息
     * 
     * @return
     */
    public Object getMsg() {
        return msg;
    }

    /**
     * 设置返回的消息
     * 
     * @param msg
     */
    public void setMsg(Object msg) {
        this.msg = msg;
    }
}

文件下载controller：

/**
     * 下载附件
     * @param response
     * @param request
     * @param blobId 附件主键
     * @throws UnsupportedEncodingException
     */
    @RequestMapping("/download")
    public void download (HttpServletResponse response,HttpServletRequest request,String sealId,String thisTime) throws UnsupportedEncodingException{
        Seal seal = sealService.getSeal(sealId);
        InputStream inputStream=new ByteArrayInputStream(seal.getSealImage());

        byte[] b = new byte[1024];
        int len = -1;
        OutputStream out = null;
         String filename="";
         if (request.getHeader("User-Agent").toUpperCase().indexOf("MSIE") >0)
             filename = URLEncoder.encode(filename, "UTF-8");//IE浏览器
         else
             filename = new String(filename.getBytes("UTF-8"), "ISO8859-1");
         response.reset();//清除首部的空白行
         //下载的文件内容
    //     response.setContentType("application/x-msdownload");
    //     response.setContentType("text/html;charset=utf-8;");
         response.setContentType("image/jpeg;charset=utf-8");
         //下载的文件头部内容(自动下载)
//         response.setHeader("Content-Disposition", "attachment;filename=" + filename.replace(" ", "_") );
        //输出文件内容
        response.setHeader("Content-type", "attachment;filename=" + filename.replace(" ", "_") );
    //    response.setHeader("Connection", "close");
        try {
            while ((len = inputStream.read(b, 0, 1024)) != -1) {
                out = response.getOutputStream();
                out.write(b, 0, len);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (out != null) {
                try {
                    out.flush();
                    out.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            if(inputStream!=null){
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            }
        }
    }

/**
     * 下载附件
     * @param response
     * @param request
     * @param blobId 附件主键
     * @throws UnsupportedEncodingException
     */
    @RequestMapping("/download")
    public void download (HttpServletResponse response,HttpServletRequest request,String sealId,String thisTime) throws UnsupportedEncodingException{
        Seal seal = sealService.getSeal(sealId);
        InputStream inputStream=new ByteArrayInputStream(seal.getSealImage());

        byte[] b = new byte[1024];
        int len = -1;
        OutputStream out = null;
         String filename="";
         if (request.getHeader("User-Agent").toUpperCase().indexOf("MSIE") >0)
             filename = URLEncoder.encode(filename, "UTF-8");//IE浏览器
         else
             filename = new String(filename.getBytes("UTF-8"), "ISO8859-1");
         response.reset();//清除首部的空白行
         //下载的文件内容
    //     response.setContentType("application/x-msdownload");
    //     response.setContentType("text/html;charset=utf-8;");
         response.setContentType("image/jpeg;charset=utf-8");
         //下载的文件头部内容(自动下载)
//         response.setHeader("Content-Disposition", "attachment;filename=" + filename.replace(" ", "_") );
        //输出文件内容
        response.setHeader("Content-type", "attachment;filename=" + filename.replace(" ", "_") );
    //    response.setHeader("Connection", "close");
        try {
            while ((len = inputStream.read(b, 0, 1024)) != -1) {
                out = response.getOutputStream();
                out.write(b, 0, len);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (out != null) {
                try {
                    out.flush();
                    out.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            if(inputStream!=null){
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            }
        }
    }

mapper：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.edu.hbcf.plugin.seal.dao.SealMapper">

    <!-- 查询所有的印章管理数据 -->
    <select id="queryListForPage" resultType="cn.edu.hbcf.plugin.seal.pojo.Seal" parameterType="cn.edu.hbcf.common.vo.Criteria">
        SELECT 
          l.id id,
          l.update_user updateUser,
          l.update_time updateTime,
          l.seal_name sealName,
          l.remark remark,
          l.is_enable isEnable,
          l.seal_image sealImage,
          s.real_name realName 
        FROM
          seal l 
          LEFT JOIN base_users s 
            ON l.update_user = s.user_id 
        WHERE l.seal_name IS NOT NULL 
          AND seal_name != '' 
        <if test="condition.limit != null">
            <![CDATA[ limit #{condition.start},#{condition.limit} ]]>
        </if>
    </select>
    
    <!-- 查询所有的印章管理数据的总数 -->
    <select id="getTotalCount" resultType="int" parameterType="cn.edu.hbcf.common.vo.Criteria">
        SELECT 
          count(*)
        FROM
          seal l 
    </select>
    <!-- 新增印章数据 -->
    <insert id="insert" parameterType="cn.edu.hbcf.plugin.seal.pojo.Seal">
        <selectKey resultType="String" keyProperty="id" order="BEFORE">
            select replace(uuid(), '-', '') from dual
        </selectKey>
        INSERT INTO seal(id,update_user,update_time,seal_name,remark,is_enable,seal_image) 
        VALUES(#{id},#{updateUser},#{updateTime},#{sealName},#{remark},#{isEnable},#{sealImage})
    </insert>
    
    <!-- 修改印章数据 -->
    <update id="update" parameterType="cn.edu.hbcf.plugin.seal.pojo.Seal">
        UPDATE seal SET update_user=#{updateUser},update_time=#{updateTime},
        <if test="sealName!=null">seal_name=#{sealName},</if>
        <if test="remark!=null">remark=#{remark},</if>
        <if test="isEnable!=null">is_enable=#{isEnable},</if>
        <if test="sealImage!=null">seal_image=#{sealImage}</if>
        WHERE id=#{id}
    </update>
    
    <!-- 批量删除印章数据 -->
    <delete id="delete">
        delete from seal 
        <where>
            id in
            <foreach collection="ids" item="item" index="index" 
                open="(" separator="," close=")">#{item}</foreach>
        </where>
    </delete>
    
    <!-- 新增印章图片到数据库中 -->
    <insert id="insertSeal" parameterType="String">
        <selectKey resultType="String" keyProperty="id" order="BEFORE">
            select replace(uuid(), '-', '') from dual
        </selectKey>
        insert into seal(id,seal_image) values(#{id},#{sealImage})
    </insert>
    
    <!-- 修改印章图片 -->
    <update id="updateSeal" parameterType="cn.edu.hbcf.plugin.seal.pojo.Seal">
        update seal set seal_image=#{sealImage} where id=#{id} 
    </update>
    
    <!-- 根据Id查询信息-->
    <select id="getSeal" resultType="cn.edu.hbcf.plugin.seal.pojo.Seal" parameterType="java.lang.String">
        SELECT 
          l.id id,
          l.update_user updateUser,
          l.update_time updateTime,
          l.seal_name sealName,
          l.remark remark,
          l.is_enable isEnable,
          l.seal_image sealImage,
          s.real_name realName 
        FROM
          seal l
          LEFT JOIN base_users s 
            ON l.update_user = s.user_id
        WHERE l.id = #{id}
    </select>
    
    <!-- 启用或者停用 -->
    <update id="isEnableOrNot" parameterType="cn.edu.hbcf.plugin.seal.pojo.Seal">
    UPDATE seal SET is_enable=#{isEnable}
        WHERE id=#{id}
    </update>
</mapper>