android 上传文件到服务器

Android客户端

package com.example.testandroid;

import java.io.DataOutputStream;

import java.io.FileInputStream;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import android.app.Activity;

import android.app.AlertDialog;

import android.content.DialogInterface;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

public class PhotoUpload extends Activity {

    private String newName = "image.jpg";

    private String uploadFile = "/sdcard/image.JPG";// 要上传的文件

    private String actionUrl = "http://192.168.0.1:8080/PhotoUpload/servlet/UploadServlet";

    private TextView mText1;

    private TextView mText2;

    private Button mButton;

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        mText1 = (TextView) findViewById(R.id.myText2);

        // 文件路径：

        mText1.setText(uploadFile);

        mText2 = (TextView) findViewById(R.id.myText3);

        // 上传网址：

        mText2.setText(actionUrl);

        /* 设置mButton的onClick事件处理 */

        mButton = (Button) findViewById(R.id.myButton);

        mButton.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {

                uploadFile();

            }

        });

    }

    /* 上传文件至Server的方法 */

    private void uploadFile() {

        String end = " ";

        String twoHyphens = "--";

        String boundary = "*****";

        try {

            URL url = new URL(actionUrl);

            HttpURLConnection con = (HttpURLConnection) url.openConnection();

            /* 允许Input、Output，不使用Cache */

            con.setDoInput(true);

            con.setDoOutput(true);

            con.setUseCaches(false);

            // 设置http连接属性

            con.setRequestMethod("POST");

            con.setRequestProperty("Connection", "Keep-Alive");

            con.setRequestProperty("Charset", "UTF-8");

            con.setRequestProperty("Content-Type",

                    "multipart/form-data;boundary=" + boundary);

            DataOutputStream ds = new DataOutputStream(con.getOutputStream());

            ds.writeBytes(twoHyphens + boundary + end);

            ds.writeBytes("Content-Disposition: form-data; "

                    + "name="file1";filename="" + newName + """ + end);

            ds.writeBytes(end);

            // 取得文件的FileInputStream

            FileInputStream fStream = new FileInputStream(uploadFile);

            /* 设置每次写入1024bytes */

            int bufferSize = 1024;

            byte[] buffer = new byte[bufferSize];

            int length = -1;

            /* 从文件读取数据至缓冲区 */

            while ((length = fStream.read(buffer)) != -1) {

                /* 将资料写入DataOutputStream中 */

                ds.write(buffer, 0, length);

            }

            ds.writeBytes(end);

            ds.writeBytes(twoHyphens + boundary + twoHyphens + end);

            fStream.close();

            ds.flush();

            /* 取得Response内容 */

            InputStream is = con.getInputStream();

            int ch;

            StringBuffer b = new StringBuffer();

            while ((ch = is.read()) != -1) {

                b.append((char) ch);

            }

            /* 将Response显示于Dialog */

            showDialog("上传成功" + b.toString().trim());

            /* 关闭DataOutputStream */

            ds.close();

        } catch (Exception e) {

            showDialog("上传失败" + e);

        }

    }

    /* 显示Dialog的method */

    private void showDialog(String mess) {

        new AlertDialog.Builder(PhotoUpload.this).setTitle("Message")

                .setMessage(mess)

                .setNegativeButton("确定", new DialogInterface.OnClickListener() {

                    public void onClick(DialogInterface dialog, int which) {

                    }

                }).show();

    }

}

服务器端servlet

package com.demo;

import java.io.File;

import java.io.IOException;

import java.util.Date;

import java.util.Iterator;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.DiskFileUpload;

import org.apache.commons.fileupload.FileItem;

public class UploadServlet extends HttpServlet {

    public void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        String temp = request.getSession().getServletContext().getRealPath("/")

                + "temp"; // 临时目录

        System.out.println("temp=" + temp);

        String loadpath = request.getSession().getServletContext()

                .getRealPath("/")

                + "Image"; // 上传文件存放目录

        System.out.println("loadpath=" + loadpath);

        DiskFileUpload fu = new DiskFileUpload(); // 需要导入commons-fileupload-1.2.2.jar

                                                    // http://commons.apache.org/fileupload/

        fu.setSizeMax(1 * 1024 * 1024); // 设置允许用户上传文件大小,单位:字节

        fu.setSizeThreshold(4096); // 设置最多只允许在内存中存储的数据,单位:字节

        fu.setRepositoryPath(temp); // 设置一旦文件大小超过getSizeThreshold()的值时数据存放在硬盘的目录

        // 开始读取上传信息

        int index = 0;

        List fileItems = null;

        try {

            fileItems = fu.parseRequest(request);

            System.out.println("fileItems=" + fileItems);

        } catch (Exception e) {

            e.printStackTrace();

        }

        Iterator iter = fileItems.iterator(); // 依次处理每个上传的文件

        while (iter.hasNext()) {

            FileItem item = (FileItem) iter.next();// 忽略其他不是文件域的所有表单信息

            if (!item.isFormField()) {

                String name = item.getName();// 获取上传文件名,包括路径

                name = name.substring(name.lastIndexOf("\") + 1);// 从全路径中提取文件名

                long size = item.getSize();

                if ((name == null || name.equals("")) && size == 0)

                    continue;

                int point = name.indexOf(".");

                name = (new Date()).getTime()

                        + name.substring(point, name.length()) + index;

                index++;

                File fNew = new File(loadpath, name);

                try {

                    item.write(fNew);

                } catch (Exception e) {

                    // TODO Auto-generated catch block

                    e.printStackTrace();

                }

            } else// 取出不是文件域的所有表单信息

            {

                String fieldvalue = item.getString();

                // 如果包含中文应写为：(转为UTF-8编码)

                // String fieldvalue = new

                // String(item.getString().getBytes(),"UTF-8");

            }

        }

        String text1 = "11";

        response.sendRedirect("result.jsp?text1=" + text1);

    }

}

activity_main.xml

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print?

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent" >

    <EditText

        android:id="@+id/myText2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentTop="true"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="116dp"

        android:ems="10"

        android:inputType="textPersonName" />

    <EditText

        android:id="@+id/myText3"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/myText2"

        android:layout_below="@+id/myText2"

        android:layout_marginTop="45dp"

        android:ems="10" />

    <Button

        android:id="@+id/myButton"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/myText3"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="61dp"

        android:text="上传" />

</RelativeLayout>