springmvc多线程并发的问题

建宇

2016-08-01

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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-----------

shiqishiqiang-----------

ang-----------

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

shiqishiqiang-----------

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

ang-----------

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

shshiqiang-----------

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

iqiang-----------

sshiqiang-----------

hiqiang-----------

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

sshiqiang-----------

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

hiqiang-----------

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

shiqishiqiang-----------

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

ang-----------

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

---------------------------------------------------------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

安科网

springmvc多线程并发的问题

建宇

建宇

建宇