Java发送Post请求

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1.Java发送Post请求方法，指定Url发送String类型数据，直接从代码里抠出来的，不必要的代码可自行注掉。

/** * post请求 *  * @param url *            post的url地址 * @param body *            要post的数据 * @return * @throws IOException */public static String post(String url, String body){// 入参校验if (url == null || body == null)return "请填写正确参数!";// 构造请求数据Map<String, String> headers = createHeaders(body);/*System.out.println("url:\r\n" + url);System.out.println("body:\r\n" + body);System.out.println("headers:\r\n" + headers);*/String result = "";try{OutputStreamWriter out = null;BufferedReader in = null;URL realUrl = new URL(url);URLConnection conn = realUrl.openConnection();// 添加请求头Set<String> keys = headers.keySet();for (String key : keys){conn.setRequestProperty(key, headers.get(key));}// 设置连接参数conn.setDoOutput(true);conn.setDoInput(true);conn.setConnectTimeout(4000);conn.setReadTimeout(5000);// 提交数据out = new OutputStreamWriter(conn.getOutputStream(), "UTF8");out.write(body);out.flush();// 读取返回数据in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF8"));String line = "";while ((line = in.readLine()) != null){result += "\n";result += line;}} catch (Exception e){e.printStackTrace();}return result;}

2.差不多一样的代码，GET和POST，直接用

package com.fisee.map;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.URL;import java.net.URLConnection;import java.util.List;import java.util.Map;import java.util.concurrent.CountDownLatch;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;public class HttpRequest { static ExecutorService fixedThreadPool = Executors.newFixedThreadPool(8);      /**     * 向指定URL发送GET方法的请求     *      * @param url     *            发送请求的URL     * @param param     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。     * @return URL 所代表远程资源的响应结果     */    public static String sendGet(final String url, final String param) {    //System.err.println("url==="+url);    //System.out.println("MSG==="+param);    final StringBuilder sb = new StringBuilder(120);    final CountDownLatch latch = new CountDownLatch(1);        fixedThreadPool.execute(new Runnable() {@Overridepublic void run() {//String result = "";        BufferedReader in = null;        try {            String urlNameString = url + "?" + param;            URL realUrl = new URL(urlNameString);            // 打开和URL之间的连接            URLConnection connection = realUrl.openConnection();            // 设置通用的请求属性            connection.setRequestProperty("accept", "application/json");            connection.setRequestProperty("connection", "Keep-Alive");            connection.setRequestProperty("user-agent",                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");            connection.setConnectTimeout(4000);              connection.setReadTimeout(15000);              // 建立实际的连接            connection.connect();            // 获取所有响应头字段            /*Map<String, List<String>> map = connection.getHeaderFields();            // 遍历所有的响应头字段            for (String key : map.keySet()) {                System.out.println(key + "--->" + map.get(key));            }*/            // 定义 BufferedReader输入流来读取URL的响应            in = new BufferedReader(new InputStreamReader(                    connection.getInputStream()));            String line;            while ((line = in.readLine()) != null) {                //result += line;            sb.append(line);            }         } catch (Exception e) {            System.out.println("com.fisee.map.HttpRequest发送GET请求出现异常！");            //e.printStackTrace();        }        // 使用finally块来关闭输入流        finally {            try {                if (in != null) {                    in.close();                }            } catch (Exception e2) {                e2.printStackTrace();            }                        latch.countDown();        }       // return result;}});        try {latch.await();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}        return sb.toString();    }    /**     * 向指定 URL 发送POST方法的请求     *      * @param url     *            发送请求的 URL     * @param param     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。     * @return 所代表远程资源的响应结果     */    public static String sendPost(String url, String param) {        PrintWriter out = null;        BufferedReader in = null;        String result = "";        try {            URL realUrl = new URL(url);            // 打开和URL之间的连接            URLConnection conn = realUrl.openConnection();            // 设置通用的请求属性            conn.setRequestProperty("accept", "*/*");            conn.setRequestProperty("connection", "Keep-Alive");            conn.setRequestProperty("user-agent",                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");            // 发送POST请求必须设置如下两行            conn.setDoOutput(true);            conn.setDoInput(true);            // 获取URLConnection对象对应的输出流            out = new PrintWriter(conn.getOutputStream());            // 发送请求参数            out.print(param);            // flush输出流的缓冲            out.flush();            // 定义BufferedReader输入流来读取URL的响应            in = new BufferedReader(                    new InputStreamReader(conn.getInputStream()));            String line;            while ((line = in.readLine()) != null) {                result += line;            }        } catch (Exception e) {            System.out.println("发送 POST 请求出现异常！"+e);            e.printStackTrace();        }        //使用finally块来关闭输出流、输入流        finally{            try{                if(out!=null){                    out.close();                }                if(in!=null){                    in.close();                }            }            catch(IOException ex){                ex.printStackTrace();            }        }        return result;    }             public static void main(String[] args) {     /*   //发送 GET 请求        String s=HttpRequest.sendGet("http://localhost:6144/Home/RequestString", "key=123&v=456");        System.out.println(s);                //发送 POST 请求        String sr=HttpRequest.sendPost("http://localhost:6144/Home/RequestPostString", "key=123&v=456");        System.out.println(sr);*/    }}

3.另外介绍一个Post工具，Firefox浏览器打开按Ctrl+Alt+P组合键即可打开其自带的Post工具，使用非常方便。

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