j2ee获取客户端参数集

Java代码 

package javacommon.util;   
  
import java.io.IOException;   
import java.io.PrintWriter;   
import java.io.UnsupportedEncodingException;   
import java.net.HttpURLConnection;   
import java.net.URL;   
  
import javax.servlet.http.HttpServletRequest;   
import javax.servlet.http.HttpServletResponse;   
  
import org.springframework.util.Assert;   
  
public class ServletUtil {   
       
    /**  
     * 取得客户端真实IP  
     * @param request  
     * @return  
     */  
    public static String  getRemortIP(HttpServletRequest request) {   
          if (request.getHeader("x-forwarded-for") == null) {   
           return request.getRemoteAddr();   
          }   
          return request.getHeader("x-forwarded-for");   
        }   
    public String getIpAddr(HttpServletRequest request) {   
           String ip = request.getHeader("x-forwarded-for");   
           if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {   
               ip = request.getHeader("Proxy-Client-IP");   
           }   
           if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {   
               ip = request.getHeader("WL-Proxy-Client-IP");   
           }   
           if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {   
               ip = request.getRemoteAddr();   
           }   
           return ip;   
       }   
       
    /**  
     * 打开URL返回状态码  
     * @param url  
     * @return  
     */  
    public static int openUrl(String urlstr)throws Exception{   
           
        URL url = new URL(urlstr);   
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();   
           
        return conn.getResponseCode();   
    }   
    /**  
     * 直接输出文本  
     * @param response  
     * @param text  
     */  
    public static void rendText(HttpServletResponse response,String text){   
        try {   
            response.setCharacterEncoding("utf-8");   
//          response.s   
            PrintWriter print=response.getWriter();   
            print.print(text);   
            print.flush();   
            print.close();   
        } catch (IOException e) {   
            // TODO Auto-generated catch block   
            e.printStackTrace();   
        }   
    }   
       
    /**  
     * 直接输出js内容  
     * @param response  
     * @param text  
     */  
    public static void printJavaScript(HttpServletResponse response,String text){   
        StringBuffer sb = new StringBuffer("<script>");      
        sb.append(text);   
        sb.append("</script>");   
        rendText(response,sb.toString());   
    }   
       
    /**  
     * 从request中取得指定参数的值   
     * @param request HttpServletRequest  
     * @param name 参数名  
     * @param defaultValue 默认值  
     * @return int  
     */  
    public static int getParameter(HttpServletRequest request,String name,int defaultValue){   
        Assert.notNull(request, "Request must not be null");   
        String v = request.getParameter(name);   
  
        if(v!=null && !v.equals("")){   
            try{   
                defaultValue = Integer.parseInt(v);   
            }catch(NumberFormatException e){   
                   
            }   
        }   
        return defaultValue;   
           
    }   
       
    /**  
     * 从request中取得指定参数的值   
     * @param request HttpServletRequest  
     * @param name 参数名  
     * @param defaultValue 默认值  
     * @return long  
     */  
    public static long getParameter(HttpServletRequest request,String name,long defaultValue){   
        Assert.notNull(request, "Request must not be null");   
        String v = request.getParameter(name);   
        if(v!=null && !v.equals("")){   
            try{   
                defaultValue = Long.parseLong(v);   
            }catch(NumberFormatException e){   
                   
            }   
        }   
        return defaultValue;   
           
    }   
       
    /**  
     * 从request中取得指定参数的值   
     * @param request HttpServletRequest  
     * @param name 参数名  
     * @param defaultValue 默认值  
     * @return string  
     */  
    public static String getParameter(HttpServletRequest request,String name,String defaultValue){   
        Assert.notNull(request, "Request must not be null");   
        try {   
            if(request.getParameter(name)==null){   
                return defaultValue;   
            }   
            String v = request.getParameter(name);   
            if(v!=null && !v.equals("")){   
                return v;   
            }   
            return defaultValue;   
        } catch (Exception e) {   
            // TODO Auto-generated catch block   
            e.printStackTrace();   
            return defaultValue;   
        }   
    }   
}