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  • Servlet 后台获取XML

    D

    package net.nw.servlet;
    import java.io.IOException;
    import java.io.PrintWriter;
    
    import javassist.expr.NewArray;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import net.nw.dao.Conn;
    import net.nw.dao.ModelcodesDAO;
    
    import java.sql.*;
    import java.util.ArrayList;
    import java.util.List;
    
    
    public class DateServlet extends HttpServlet {
    	private static final long	serialVersionUID	= 1L;
    	private ModelcodesDAO mcd = new ModelcodesDAO();
    	public void doGet(HttpServletRequest request, HttpServletResponse response)
    			throws ServletException, IOException {
    		String where = null;
    		String currdate= request.getParameter("currdate");
    		String projectname=request.getParameter("projectname");	
    		String codeid = request.getParameter("modelname");
    		String mname = mcd.getNameById(Integer.parseInt(codeid));
    		where="where ProjectName like '%"+projectname+"%'  AND ModelCode like '%"+mname+"%'";
    		
    		StringBuffer xmlDOM = new StringBuffer();
    		ResultSet rs=null;
    		rs = this.getResultSet(where);		
    		xmlDOM.append("<root>");
    		try {			
    			xmlDOM.append("<defects>");
    			while (rs.next()) {
    				xmlDOM.append("<defectmonth>");
    				xmlDOM.append("<Day1>" + rs.getString("Day1") + "</Day1>");
    				xmlDOM.append("<Day2>" + rs.getString("Day2") + "</Day2>");
    				xmlDOM.append("</defectmonth>");
    				request.setAttribute("daay1", rs.getString("Day1"));
    				System.out.println(request.getAttribute("daay1"));
    			}
    			rs.close();
    			xmlDOM.append("</defects>");
    		} catch (SQLException e) {
    			System.out.println(e.getMessage());
    		}		
    	
    		xmlDOM.append("</root>");		
    		this.print(request, response, xmlDOM.toString());
    	}
    
    
    	public void doPost(HttpServletRequest request, HttpServletResponse response)
    			throws ServletException, IOException {
    			this.doGet(request, response);		
    	}
    	
    
    	private void print(HttpServletRequest request, HttpServletResponse response,String xmlDOM) throws IOException{
    		response.setCharacterEncoding("utf-8");
    		response.setContentType("text/xml");
    		PrintWriter out = response.getWriter();
    		out.print(xmlDOM);
    		out.close();
    	}
    	
    	
    	private ResultSet getResultSet(String where){
    		Connection conn = null;
    		PreparedStatement pstmt = null;
    		ResultSet rs = null;
    		try {
    			conn = getConn();
    		} catch (ClassNotFoundException e) {
    			System.out.println(e.getMessage());
    		} catch (SQLException e) {
    			System.out.println(e.getMessage());
    		}
    		
    		String sql = "select * from defects_infor_daily "+where; 
    		System.out.println(sql);
    		//String sql = "select top "+len+" * from person where pid >= ? order by pid";
    		
    		try {
    			pstmt = conn.prepareStatement(sql);			
    			rs = pstmt.executeQuery();
    		} catch (SQLException e) {
    			System.out.println(e.getMessage());
    		}
    		return rs;
    	}
    	
    	
    	private Connection getConn() throws ClassNotFoundException, SQLException{
    		
    		String driver = "com.mysql.jdbc.Driver"; 
            String url="jdbc:mysql://109.110.100.56/tsdr_project";
        	String user="root";
        	String password="";
    		Class.forName(driver);
    		System.out.println("��ݿ�����");
    		return DriverManager.getConnection(url,user,password);
    		
    	}
    
    }
    

    前台获取

      var js = {
    	XMLHttp:null,
    		//发送请求函数
    	sendRequest:function(url,responseFun,callback){
    		//创建XMLHTTPRequest对象
    		(function(){						
    			//根据浏览器类型创建XMLHTTPRequest对象
    			if(window.XMLHttpRequest){
    				js.XMLHttp = new XMLHttpRequest();
    			}
    			else{
    				try{
    					js.XMLHttp = new ActionXObject("Msxml2.XMLHTTP");
    				}catch (e){
    				  try{
    						js.XMLHttp = new ActiveXObject("Microsoft.XMLHTTP");
    				  } catch (e0){alert("Microsoft"+e0);}
    				}
    			}
    						
    		})();
    					
    		js.XMLHttp.open("POST", url, true);
    		js.XMLHttp.onreadystatechange = function(responseFunction){
    		  if(js.XMLHttp.readyState == 4){
    				if(js.XMLHttp.status == 200){						
    					responseFun(js.XMLHttp);
    				}else{
    					document.getElementById("canvasDivZhe").innerHTML = "<font color='red'>连接服务器异常...</font>"	;
    				}
    		  }
    		  else{
    			//document.getElementById("div").innerHTML = "<font color='red'>数据加载中...</font>"	;	
    		  }
    		};//指定响应函数
    		js.XMLHttp.send(null);
    		return js.XMLHttp;
    	}
      };
    				
    				
      //响应函数
      function responseFunction(xmlhttp){				
    		var xmlDOM = xmlhttp.responseXML; //接受服务器返回的xml文档	
    		//document.getElementById("div").innerHTML =xmlhttp.responseText;
    		//alert(xmlhttp.responseText);
    		parse(xmlDOM);//解析XML文档
      }
    				
       //解析XML文档
      function parse(xmlDOM){
    		//alert(xmlDOM);
    		//var da=#request.daay1;
    		var person = xmlDOM.getElementsByTagName("defectmonth");
    		var day1=person[0].getElementsByTagName("Day1")[0].firstChild.data;
    		alert(day1);
    		  		
    }//function end
    //主调函数,以当前页作为参数		
      function AjaxTest(currdate,projectname,modelname) {				
    		var projectname="<%=session.getAttribute("projectname_session")%>";	
    		var modelname= document.getElementById("codeid").value;
    		//alert(currdate+ " " +projectname+" "+modelname);
    		js.sendRequest("DateServlet?currdate="+currdate+"&projectname="+projectname+"&modelname="+modelname,responseFunction,null);			
      }
    			
    
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  • 原文地址:https://www.cnblogs.com/wujixing/p/5776268.html
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