jQuery與Servlet配合實現跨域請求

jQuery與Servlet配合實現跨域請求:

方法：1.ajax post到servlet

      2.servlet遠程訪問遠程url，並返回數據給頁面。

public void doPost(HttpServletRequest req, HttpServletResponse resp) 

            throws ServletException, IOException { 
        boolean requestType = false;//標記遠程請求類型，默認為GET方式 
        PrintWriter out = resp.getWriter(); 
        Enumeration keys = req.getParameterNames();//取出客戶端傳入的所有參數名 
        ArrayList<String> params = new ArrayList<String>(); 
        String url=null; 
        while (keys.hasMoreElements()){ 
            String key = (String) keys.nextElement(); 
            
            params.add(key);//其它加入參數列表，此處為參與遠程請求的參數 
            requestType = true;//修改標記，表求遠程請求為POST方式 
           
        } 
         
        HttpClient client = new HttpClient(); 
        HttpMethod method = null; 
        if(requestType){//判斷請求方式，並實例化HttpMethod對象，true:POST,false:GET 
            method = new UTF8PostMethod(url); 
            for(String name : params){//迭代POST參數，加入到請求中 
                String _value = req.getParameter(name); 
                ((PostMethod)method).setParameter(name,_value); 
            } 
        }else{ 
            method = new GetMethod(url); 
        }        
        client.executeMethod(method);//執行請求 
        String bodystr = method.getResponseBodyAsString();//返回結果 
        out.println(bodystr);//將結果返回給客戶端 
    } 
     
    /**
     * 內部類，轉換URL字符串為UTF-8
     * @author Administrator
     *
     */ 
    private static class UTF8PostMethod extends PostMethod {  
        public UTF8PostMethod(String url) {  
            super(url);  
        }  
        @Override  
        public String getRequestCharSet() {  
            return "UTF-8";  
        }  
    }