springmvc多线程并发的问题
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