Servlet接收Post请求以及回复请求

本文主要介绍了Servlet如何接受HttpCilent发送过来的请求以及对请求进行回复

Servlet需要用到Servlet-api.jar包

package com.firstdata.project;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.nio.ByteBuffer;import java.util.ArrayList;import java.util.ListIterator;import javax.servlet.ServletException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class Test {    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        doPost(request, response);    }    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        HttpServletRequest req = (HttpServletRequest) request;        HttpServletResponse res = (HttpServletResponse) response;        String origRequestMsg = null;        byte[] reqBuf = null;        try {            InputStream is = req.getInputStream();            reqBuf = readInputBytes(is);            origRequestMsg = new String(reqBuf, "GBK");            System.out.println(origRequestMsg);        } catch (Exception e) {            e.printStackTrace();        }        // 出来完收到信息之后可以就可以回复请求了        try {            OutputStream os = res.getOutputStream();            String resMsgOut = "this is response message";            os.write(resMsgOut.getBytes("GBK"));        } catch (Exception e) {            e.printStackTrace();        }    }    /**     * reads input stream passed and populates bytes     *      * @param is     * InputStream     * @return byte[]     * @throws IOException     */    private byte[] readInputBytes(InputStream is) throws IOException {        ArrayList<ByteCountObj> inputByteList = new ArrayList<ByteCountObj>();        byte[] inBuf = new byte[2000];        int coutRead = is.read(inBuf);        while (coutRead != -1) {            ByteCountObj obj = new ByteCountObj(inBuf, coutRead);            inputByteList.add(obj);            inBuf = new byte[2000];            coutRead = is.read(inBuf);        }        coutRead = 0;        ListIterator<ByteCountObj> it = inputByteList.listIterator();        while (it.hasNext()) {            ByteCountObj ob = it.next();            coutRead += ob.getByteCount();        }        ByteBuffer byteBuf = ByteBuffer.allocate(coutRead);        it = inputByteList.listIterator();        while (it.hasNext()) {            ByteCountObj ob = it.next();            coutRead = ob.getByteCount();            inBuf = ob.getByteBuf();            byteBuf.put(inBuf, 0, coutRead);        }        if (byteBuf.hasArray()) {            return byteBuf.array();        } else {            return null;        }    }    /**     * 用来储存获取到的byte[]以及字节流的长度     *      * @author     *      */    public class ByteCountObj {        private byte[] byteBuf;        private int byteCount;        public byte[] getByteBuf() {            return byteBuf;        }        public int getByteCount() {            return byteCount;        }        public ByteCountObj(byte[] byteBuf, int byteCount) {            this.byteBuf = byteBuf;            this.byteCount = byteCount;        }    }}