Java模拟POST表单提交HttpClient操作

public static void Login() {
       String url = "http://www.***.com/login";
       PostMethod postMethod = new PostMethod(url);
       // 填入各个表单域的值
       NameValuePair[] data = {
               new NameValuePair("account", "yijianfeng_vip@163.com"),
               new NameValuePair("nextUrl", ""),
               new NameValuePair("lcallback", ""),
               new NameValuePair("password    ", "******"),
               new NameValuePair("persistent", "1"), };
       // 将表单的值放入postMethod中
       postMethod.setRequestBody(data);
       // 执行postMethod
       int statusCode = 0;
       try {
           statusCode = httpClient.executeMethod(postMethod);
       } catch (HttpException e) {
           e.printStackTrace();
       } catch (IOException e) {
           e.printStackTrace();
       }
       // HttpClient对于要求接受后继服务的请求，象POST和PUT等不能自动处理转发
       // 301或者302
       if (statusCode == HttpStatus.SC_MOVED_PERMANENTLY
               || statusCode == HttpStatus.SC_MOVED_TEMPORARILY) {
           // 从头中取出转向的地址
           Header locationHeader = postMethod.getResponseHeader("location");
           String location = null;
           if (locationHeader != null) {
               location = locationHeader.getValue();
               System.out.println("diandianLogin:" + location);
           } else {
               System.err.println("Location field value is null.");
           }
           return;
       } else {
           System.out.println(postMethod.getStatusLine());
           String str = "";
           try {
               str = postMethod.getResponseBodyAsString();
           } catch (IOException e) {
               e.printStackTrace();
           }
           System.out.println(str);
       }
       postMethod.releaseConnection();
       return;
   }





其中需要的jar包：

1、 commons-httpclient.jar

2、commons-codec.jar

3、commons-logging.jar

今天开发时，遇到利用Java中HttpClient类以POST方式提交数据，目标收到后中文乱码问题。
请求端代码：

/**
 * HttpClient提交参数
 * @author sunyunfang@126.com
 */
public static void main(String[] args) throws IOException {
    HttpClient client = new HttpClient();
    client.getHostConfiguration().setHost("127.0.0.1", 8081, "http");
    // 使用POST方式提交数据
    HttpMethod method = getPostMethod();
    client.executeMethod(method);
    // 打印服务器返回的状态
    System.out.println(method.getStatusLine());
    // 打印结果页面
    String response = new String(method.getResponseBodyAsString().getBytes("8859_1"));
    // 打印返回的信息
    System.out.println(response);
    method.releaseConnection();
}

// 使用POST方式提交数据
private static HttpMethod getPostMethod() {
    String url = "/PushServer/notification.do?action=sendOneMsg";
    NameValuePair message = new NameValuePair("message", "消息内容。");
    post.setRequestBody(new NameValuePair[]{message});
    return post;
}

// 使用GET方式提交数据
private static HttpMethod getGetMethod() {
    return new GetMethod("/PushServer/notification.do?action=sendOneMsg&message=abcd");
}

目标端代码：

/**
 * 供MsgServer远程调用
 * @param request
 * @param response
 * @return
 * @throws Exception
 * @author SunYunfang@126.com
 */
public ModelAndView sendOneMsg(HttpServletRequest request,
        HttpServletResponse response) throws Exception {
    String message = ServletRequestUtils.getStringParameter(request, "message");
}

这段代码执行后，目标能收到信息，但是中文乱码，也没有找到转码的方法。

经分析，原来使用 NameValuePair 加入的HTTP请求的参数最终都会转化为 RequestEntity 提交到HTTP服务器。接着在PostMethod的父类 EntityEnclosingMethod 中发现，只要重载getRequestCharSet()方法就能设置提交的编码(字符集)。

修正后：

/**
 * HttpClient提交参数
 * @author SunYunfang@126.com
 */
public static void main(String[] args) throws IOException {
    HttpClient client = new HttpClient();
    client.getHostConfiguration().setHost("127.0.0.1", 8081, "http");
    // 使用POST方式提交数据
    HttpMethod method = getPostMethod();
    client.executeMethod(method);
    // 打印服务器返回的状态
    System.out.println(method.getStatusLine());
    // 打印结果页面
    String response = new String(method.getResponseBodyAsString().getBytes("8859_1"));
    // 打印返回的信息
    System.out.println(response);
    method.releaseConnection();
}

// 使用POST方式提交数据
private HttpMethod getPostMethod() {
    String url = "/PushServer/notification.do?action=sendOneMsg";
    PostMethod post = new UTF8PostMethod(url);
    NameValuePair message = new NameValuePair("message", "消息内容。");
    post.setRequestBody(new NameValuePair[]{message});
    return post;
}

//Inner class for UTF-8 support
public static class UTF8PostMethod extends PostMethod{
    public UTF8PostMethod(String url){
    super(url);
    }
    @Override
    public String getRequestCharSet() {
        //return super.getRequestCharSet();
        return "UTF-8";
    }
}

// 使用GET方式提交数据
private static HttpMethod getGetMethod() {
    return new GetMethod("/PushServer/notification.do?action=sendOneMsg&message=abcd");
}