springmvc多线程并发的问题

oxuzhenyi 2016-08-01

 下面的类直接copy到eclipse中进行测试

---------------------------------下面是springmvc的请求类-------------------------

@Controller

@Scope("prototype")

@RequestMapping(value = "/${adminPath}/categoryController")

public class CategoryController extends BaseController {

/**

* Logger for this class

*/

         private static final Logger logger = Logger.getLogger(CategoryController.class);

      private static final String CATEGORY_LIST = "system/category/categoryList";

     private static final String CATEGORY_ADD_OR_UPDATE = "system/category/category";

@Autowired

private CategoryServiceI categoryService;

@Autowired

private SystemService systemService;

//PrintName printName = new PrintName();

/**

* 分类管理列表 页面跳转

* @return

*/

@RequestMapping(params = "category")

public String category(HttpServletRequest request) {

PrintName printName = new PrintName();

printName.printName("shiqiang");

return CATEGORY_LIST;

}

}

-------------------------------------------下面是方被测试的方法-------------------------

由此检验是否有问题

public class PrintName {

//synchronized

public  void printName(String name){ 

//synchronized(PrintName.class){

for(int i=0;i<name.length();i++){

System.out.print(name.charAt(i)); 

}

System.out.println("-----------");

//} 

}

}

------------------------------------------下面是测试并发的请求类-------------------------------

其他的不用管,主要关注main方法里面的并发请求

package www.wifuns.com.runnable;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintWriter;

import java.net.URL;

import java.net.URLConnection;

import java.util.List;

import java.util.Map;

import java.util.concurrent.atomic.AtomicInteger;

public class BingFa {

 private static AtomicInteger j =new AtomicInteger(0);

 public static void main(String[] args) {

//        //发送 GET 请求

//        String s=BingFa.sendGet("http://localhost:6144/Home/RequestString", "key=123&v=456");

//        System.out.println(s);

      for(int i=0;i<300;i++){ 

      new Thread(new Runnable(){

@Override

public void run() {

BingFa bf = new BingFa();

       String sr=bf.sendPost("http://192.168.1.198/wuliu/wifuns/categoryController.do?category", "key=123&v=456");

       System.out.println(sr); 

       j.incrementAndGet();

}

 }).start();

      } 

      

      try {

Thread.sleep(4000);

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

      System.out.println(j.get());

 }

/**

     * 向指定URL发送GET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=value1&name2=value2 的形式。

     * @return URL 所代表远程资源的响应结果

     */

    public  String sendGet(String url, String param) {

        String result = "";

        BufferedReader in = null;

        try {

            String urlNameString = url + "?" + param;

            URL realUrl = new URL(urlNameString);

            // 打开和URL之间的连接

            URLConnection connection = realUrl.openConnection();

            // 设置通用的请求属性

            connection.setRequestProperty("accept", "*/*");

            connection.setRequestProperty("connection", "Keep-Alive");

            connection.setRequestProperty("user-agent",

                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");

            // 建立实际的连接

            connection.connect();

            // 获取所有响应头字段

            Map<String, List<String>> map = connection.getHeaderFields();

            // 遍历所有的响应头字段

            for (String key : map.keySet()) {

                System.out.println(key + "--->" + map.get(key));

            }

            // 定义 BufferedReader输入流来读取URL的响应

            in = new BufferedReader(new InputStreamReader(

                    connection.getInputStream()));

            String line;

            while ((line = in.readLine()) != null) {

                result += line;

            }

        } catch (Exception e) {

            System.out.println("发送GET请求出现异常!" + e);

            e.printStackTrace();

        }

        // 使用finally块来关闭输入流

        finally {

            try {

                if (in != null) {

                    in.close();

                }

            } catch (Exception e2) {

                e2.printStackTrace();

            }

        }

        return result;

    }

    /**

     * 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=value1&name2=value2 的形式。

     * @return 所代表远程资源的响应结果

     */

    public  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;

    }    

}

----------------------------------------------------下面是输出结果-----------------------------

输出中有不规则的结果--是否说明了 并发的问题

shiqiang-----------

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---------------------------------------------------------结论---------------------------------

1、按网上说的 这种情况应该是线程安全的。

2、但是按照上面测试情况好像不行呀。

3、如果在被测试的方法上添加 synchronized  结果是正常的

4、求解

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