Servlet接收URL类请求做出响应-优快云博客

本文介绍了一个Java Web应用中的Servlet如何处理HTTP请求中的XML数据，并创建新的XML响应返回给客户端的过程。涉及XML解析、DOM4J使用及编码转换等内容。

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package com.yl.servlet;

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;

public class ForeignServlet extends HttpServlet {

	public ForeignServlet() {
		super();
	}

	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}


	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		requestXML(request, response);
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		requestXML(request, response);
	}

	public void init() throws ServletException {
	}

	public void requestXML(HttpServletRequest request, HttpServletResponse response) throws IOException
	{
		/**********************************读取传进来的xml字符流**********************************************/
        BufferedReader bfreader=request.getReader();
        StringBuffer sb=new StringBuffer();
        String oneLine=null;

        while((oneLine=bfreader.readLine())!=null)
        {
            sb.append(oneLine);
            sb.append("\r\n");
        }        
        bfreader.close();
        String str=new String(sb.toString().getBytes("iso8859_1"),"GB2312");//避免字符串中有中文所以做一次编码转换       

       // NumDeptDataForeignService service=new NumDeptDataForeignService();

        /*将读取到的XML格式字符进行解析并执行相关的操作要求*/
        System.out.println("#####输入的字符串：\n"+str);

        //Document doc=service.proccessRequest(str);

        Document rootdoc = DocumentHelper.createDocument();
        Element myElement = rootdoc.addElement("student");
        Element andy = myElement.addElement("andy");
        andy.setText("andy");

        Element Jane = myElement.addElement("Jane");
        Jane.setText("Jane");


       // byte[] xmlByte=doc.asXML().getBytes("GB2312");
        System.out.println("#####开始输出字符串");
        /**********************************输出xml字符流**********************************************/
        OutputStream out=response.getOutputStream();
        if(rootdoc!=null)
        {

            //-------------------------------------
            //将返回的文档对象写入到字节数组中去
            //-------------------------------------
            ByteArrayOutputStream bOut=new ByteArrayOutputStream();
            OutputFormat format=OutputFormat.createPrettyPrint();            
            format.setEncoding("GB2312"); //设置XML文档的编码类型
            format.setSuppressDeclaration(false);//设置是否打印文档头，即：<?xml version="1.0" encoding="GB2312"?>
            format.setIndent(true); //设置是否缩进
            format.setIndent("   "); //以空格方式实现缩进
            format.setNewlines(true); //设置是否换行           

            XMLWriter writer=new XMLWriter(bOut,format);        
            writer.write(rootdoc);  //将doc写入到字节数组流中去

            String xmlstr=bOut.toString();

            System.out.println(xmlstr);

            writer.close();
            bOut.close();
            //-------------------------------------
            //将字节数组写到输出流中去
            //-------------------------------------
            byte[] xmlByte=xmlstr.getBytes("GB2312");  //转码
            System.out.println("返回数据的字节数："+xmlByte.length); 
            BufferedOutputStream bufferOut=new BufferedOutputStream(out,1024*1024); //将缓冲区设置为1M
            bufferOut.write(xmlByte);
            bufferOut.close();
        }
        out.close();
        System.out.println("#####写入输出流完成");
	}
}