Java --http請求

最近作工程時，須要用到http請求框架，項目經理寫了一份，我測試過，可使用，這裏轉摘過來。

package com.zhiji.caren.utils;

/**    
程序名     HttpRequestUtils.java
程序功能    http請求類
做成者    xxxx
做成日期    2015-11-11
======================修改履歷======================
項目名                    狀態            做成者        做成日期
--------------------------------------------------
caren                新規            xxxx        2015-11-11
=================================================
*/

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.URL;
import java.net.URLConnection;
import java.util.Iterator;
import java.util.Map;

public class HttpRequestUtils {
    
    private String charset = "utf-8";
    private Integer connectTimeout = null;
    private Integer socketTimeout = null;
    private String proxyHost = null;
    private Integer proxyPort = null;
    private String contentType = "application/x-www-form-urlencoded";
    
    /**
     * Do GET request
     * @param url
     * @return
     * @throws Exception
     * @throws IOException
     */
    public String doGet(String url) throws Exception {
        
        URL localURL = new URL(url);
        
        URLConnection connection = openConnection(localURL);
        HttpURLConnection httpURLConnection = (HttpURLConnection)connection;
        
        httpURLConnection.setRequestProperty("Accept-Charset", charset);
        httpURLConnection.setRequestProperty("Content-Type", contentType);
        
        InputStream inputStream = null;
        InputStreamReader inputStreamReader = null;
        BufferedReader reader = null;
        StringBuffer resultBuffer = new StringBuffer();
        String tempLine = null;
        
        if (httpURLConnection.getResponseCode() >= 300) {
            throw new Exception("請求失敗, Response code is " + httpURLConnection.getResponseCode());
        }
        
        try {
            inputStream = httpURLConnection.getInputStream();
            inputStreamReader = new InputStreamReader(inputStream);
            reader = new BufferedReader(inputStreamReader);
            
            while ((tempLine = reader.readLine()) != null) {
                resultBuffer.append(tempLine);
            }
            
        } finally {
            
            if (reader != null) {
                reader.close();
            }
            
            if (inputStreamReader != null) {
                inputStreamReader.close();
            }
            
            if (inputStream != null) {
                inputStream.close();
            }
            
        }

        return resultBuffer.toString();
    }
    
    /**
     * Do POST request
     * @param url
     * @param parameterMap（使用hashmap格式傳遞）
     * @return
     * @throws Exception 
     */
    @SuppressWarnings("rawtypes")
    public String doPost(String url, Map parameterMap, boolean isJson) throws Exception {
        
        /* Translate parameter map to parameter date string */
        StringBuffer parameterBuffer = new StringBuffer();
        if(isJson){
            parameterBuffer.append("{");
        }
        if (parameterMap != null) {
            Iterator iterator = parameterMap.keySet().iterator();
            String key = null;
            String value = null;
            while (iterator.hasNext()) {
                key = (String)iterator.next();
                if (parameterMap.get(key) != null) {
                    value = (String)parameterMap.get(key);
                } else {
                    value = "";
                }
                
                if(isJson){
                    parameterBuffer.append("\"").append(key).append("\"").append(":").append("\"").append(value).append("\"");
                    if (iterator.hasNext()) {
                        parameterBuffer.append(",");
                    }else{
                        parameterBuffer.append("}");
                    }
                }
                else{
                    parameterBuffer.append(key).append("=").append(value);
                    if (iterator.hasNext()) {
                        parameterBuffer.append("&");
                    }
                }
            }
        }
        
        System.out.println("POST 參數 : " + parameterBuffer.toString());
        
        URL localURL = new URL(url);
        
        URLConnection connection = openConnection(localURL);
        HttpURLConnection httpURLConnection = (HttpURLConnection)connection;
        
        httpURLConnection.setDoOutput(true);
        httpURLConnection.setRequestMethod("POST");
        httpURLConnection.setRequestProperty("Accept-Charset", charset);
        httpURLConnection.setRequestProperty("Content-Type", contentType);
        httpURLConnection.setRequestProperty("Content-Length", String.valueOf(parameterBuffer.length()));
        
        OutputStream outputStream = null;
        OutputStreamWriter outputStreamWriter = null;
        InputStream inputStream = null;
        InputStreamReader inputStreamReader = null;
        BufferedReader reader = null;
        StringBuffer resultBuffer = new StringBuffer();
        String tempLine = null;
        
        try {
            outputStream = httpURLConnection.getOutputStream();
            outputStreamWriter = new OutputStreamWriter(outputStream, charset);
            
            outputStreamWriter.write(parameterBuffer.toString());
            outputStreamWriter.flush();
            
            if (httpURLConnection.getResponseCode() >= 300) {
                throw new Exception("HTTP Request is not success, Response code is " + httpURLConnection.getResponseCode());
            }
            
            inputStream = httpURLConnection.getInputStream();
            inputStreamReader = new InputStreamReader(inputStream, charset);
            reader = new BufferedReader(inputStreamReader);
            
            while ((tempLine = reader.readLine()) != null) {
                resultBuffer.append(tempLine);
            }
            
        } finally {
            
            if (outputStreamWriter != null) {
                outputStreamWriter.close();
            }
            
            if (outputStream != null) {
                outputStream.close();
            }
            
            if (reader != null) {
                reader.close();
            }
            
            if (inputStreamReader != null) {
                inputStreamReader.close();
            }
            
            if (inputStream != null) {
                inputStream.close();
            }
            
        }

        return resultBuffer.toString();
    }

    private URLConnection openConnection(URL localURL) throws IOException {
        URLConnection connection;
        if (proxyHost != null && proxyPort != null) {
            Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(proxyHost, proxyPort));
            connection = localURL.openConnection(proxy);
        } else {
            connection = localURL.openConnection();
        }
        return connection;
    }
    
    /**
     * Render request according setting
     * @param request
     */
    @SuppressWarnings("unused")
    private void renderRequest(URLConnection connection) {
        
        if (connectTimeout != null) {
            connection.setConnectTimeout(connectTimeout);
        }
        
        if (socketTimeout != null) {
            connection.setReadTimeout(socketTimeout);
        }
        
    }

    /*
     * Getter & Setter
     */
    public Integer getConnectTimeout() {
        return connectTimeout;
    }

    public void setConnectTimeout(Integer connectTimeout) {
        this.connectTimeout = connectTimeout;
    }

    public Integer getSocketTimeout() {
        return socketTimeout;
    }

    public void setSocketTimeout(Integer socketTimeout) {
        this.socketTimeout = socketTimeout;
    }

    public String getProxyHost() {
        return proxyHost;
    }

    public void setProxyHost(String proxyHost) {
        this.proxyHost = proxyHost;
    }

    public Integer getProxyPort() {
        return proxyPort;
    }

    public void setProxyPort(Integer proxyPort) {
        this.proxyPort = proxyPort;
    }

    public String getCharset() {
        return charset;
    }

    public void setCharset(String charset) {
        this.charset = charset;
    }

    public String getContentType() {
        return contentType;
    }

    public void setContentType(String contentType) {
        this.contentType = contentType;
    }
    
    
    public static void main(String[] args) {
        
    }
}

在java中調用以下

                HashMap<String, String> map = new HashMap<String, String>();
                String messageContent = messageRel.getMessageContent();
                if(messageContent.length() > 50){
                    messageContent = messageContent.substring(50) + "...";
                }
                map.put("receiveUserId", messageRel.getReceiveUserId());
                map.put("title", Constant.interestTitle);
                map.put("afterOpen", "7");
                map.put("sendUserId", messageRel.getSendUserId());
                map.put("sendMessage", messageContent);
                
                HttpRequestUtils request = new HttpRequestUtils();
                //注意這裏設置字符編碼
                request.setContentType("application/json");
                try {
                    String response = request.doPost(Constant.pushUrl, map, true);
                    System.out.println("推送消息結果" + response);
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }