本文目录一览：

1. java HttpPost怎么传递参数
2. 如何使用java模拟post请求
3. java中怎样用post，get，put请求

java HttpPost怎么传递参数

public class HttpURLConnectionPost {
    /**
     * @param args
     * @throws IOException
     */
    public static void main(String[] args) throws IOException {
        readContentFromPost();
    }
    public static void readContentFromPost() throws IOException {
        // Post请求的url，与get不同的是不需要带参数
        URL postUrl = new URL("");
        // 打开连接
        HttpURLConnection connection = (HttpURLConnection) postUrl.openConnection();
        // 设置是否向connection输出，因为这个是post请求，参数要放在
        // http正文内，因此需要设为true
        connection.setDoOutput(true);
        // Read from the connection. Default is true.
        connection.setDoInput(true);
        // 默认是 GET方式
        connection.setRequestMethod("POST");
        // Post 请求不能使用缓存
        connection.setUseCaches(false);
        //设置本次连接是否自动重定向
        connection.setInstanceFollowRedirects(true);
        // 配置本次连接的Content-type，配置为application/x-www-form-urlencoded的
        // 意思是正文是urlencoded编码过的form参数
        connection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
        // 连接，从postUrl.openConnection()至此的配置必须要在connect之前完成，
        // 要注意的是connection.getOutputStream会隐含的进行connect。
        connection.connect();
        DataOutputStream out = new DataOutputStream(connection.getOutputStream());
        // 正文，正文内容其实跟get的URL中 '? '后的参数字符串一致
        String content = "字段名=" + URLEncoder.encode("字符串值", "编码");
        // DataOutputStream.writeBytes将字符串中的16位的unicode字符以8位的字符形式写到流里面
        out.writeBytes(content);
        //流用完记得关
        out.flush();
        out.close();
        //获取响应
        BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        String line;
        while ((line = reader.readLine()) != null){
            System.out.println(line);
        }
        reader.close();
        //该干的都干完了,记得把连接断了
        connection.disconnect();
    }
}

扩展资料：

关于Java HttpURLConnection使用

public static String sendPostValidate(String serviceUrl, String postData, String userName, String password){
    PrintWriter out = null;
    BufferedReader in = null;
    String result = "";
    try {
        log.info("POST接口地址:"+serviceUrl);
        URL realUrl = new URL(serviceUrl);
        // 打开和URL之间的连接
        URLConnection conn = realUrl.openConnection();
        HttpURLConnection httpUrlConnection = (HttpURLConnection) conn;
        // 设置通用的请求属性
        httpUrlConnection.setRequestProperty("accept","*/*");
        httpUrlConnection.setRequestProperty("connection", "Keep-Alive");
        httpUrlConnection.setRequestProperty("user-agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
        httpUrlConnection.setRequestMethod("POST");
        httpUrlConnection.setRequestProperty("Content-Type","application/json;charset=UTF-8");
        Base64 base64 = new Base64();
        String encoded = base64.encodeToString(new String(userName+ ":" +password).getBytes());
        httpUrlConnection.setRequestProperty("Authorization", "Basic "+encoded);
        // 发送POST请求必须设置如下两行
        httpUrlConnection.setDoOutput(true);
        httpUrlConnection.setDoInput(true);
        // 获取URLConnection对象对应的输出流
        out = new PrintWriter(new OutputStreamWriter(httpUrlConnection.getOutputStream(),"utf-8"));
        // 发送请求参数
        out.print(postData);
        out.flush();
        // 定义BufferedReader输入流来读取URL的响应
        in = new BufferedReader(new InputStreamReader(httpUrlConnection.getInputStream(),"utf-8"));
        String line;
        while ((line = in.readLine()) != null) {
            result += line;
        }
        return result;
    } catch (Exception e) {
        log.info("调用异常",e);
        throw new RuntimeException(e);
    }
    //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 e){
            log.info("关闭流异常",e);
        }
    }
}

如何使用java模拟post请求

/**
 * 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=value1name2=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;
}

java中怎样用post，get，put请求

java中用post，get，put请求方法：

public static String javaHttpGet(String url,String charSet){
    String resultData = null;
    try {
        URL pathUrl = new URL(url); //创建一个URL对象
        HttpURLConnection urlConnect = (HttpURLConnection) pathUrl.openConnection(); //打开一个HttpURLConnection连接
        urlConnect.setConnectTimeout(30000); // 设置连接超时时间
        urlConnect.connect();
        if (urlConnect.getResponseCode() == 200) { //请求成功
            resultData = readInputStream(urlConnect.getInputStream(), charSet);
        }
    } catch (MalformedURLException e) {
        LogL.getInstance().getLog().error("URL出错！", e);
    } catch (IOException e) {
        LogL.getInstance().getLog().error("读取数据流出错！", e);
    }
    return resultData;
}

public static String javaHttpPost(String url,Map<String,Object> map,String charSet){
    String resultData=null;
    StringBuffer params = new StringBuffer();
    try {
        Iterator<Map.Entry<String, Object>> ir = map.entrySet().iterator();
        while (ir.hasNext()) {
            Map.Entry<String, Object> entry = (Map.Entry<String, Object>) ir.next();
            params.append(URLEncoder.encode(entry.getKey(),charSet) + "=" + URLEncoder.encode(entry.getValue().toString(), charSet) + "&");
        }
        byte[] postData = params.deleteCharAt(params.length()).toString().getBytes();
        URL pathUrl = new URL(url); //创建一个URL对象
        HttpURLConnection urlConnect = (HttpURLConnection) pathUrl.openConnection();
        urlConnect.setConnectTimeout(30000); // 设置连接超时时间
        urlConnect.setDoOutput(true); //post请求必须设置允许输出
        urlConnect.setUseCaches(false); //post请求不能使用缓存
        urlConnect.setRequestMethod("POST"); //设置post方式请求
        urlConnect.setInstanceFollowRedirects(true);
        urlConnect.setRequestProperty("Content-Type","application/x-www-form-urlencoded; charset="+charSet);// 配置请求Content-Type
        urlConnect.connect(); // 开始连接
        DataOutputStream dos = new DataOutputStream(urlConnect.getOutputStream()); // 发送请求参数
        dos.write(postData);
        dos.flush();
        dos.close();
        if (urlConnect.getResponseCode() == 200) { //请求成功
            resultData = readInputStream(urlConnect.getInputStream(),charSet);
        }
    } catch (MalformedURLException e) {
        LogL.getInstance().getLog().error("URL出错！", e);
    } catch (IOException e) {
        LogL.getInstance().getLog().error("读取数据流出错！", e);
    } catch (Exception e) {
        LogL.getInstance().getLog().error("POST出错！", e);
    }
    return resultData;
}