guice整合guice-servlet，web scope注解 <6>

guice servlet提供了几个比较有用的web scope，类似与传统servlet
的session，request这些提供的范围等。

guice servlet 提供的web scope 如下:

• @RequestScoped
• @SessionScoped
• @RequestParameters

1.@RequestScoped

例子如下:

package cn.northpark.action;

import com.google.inject.servlet.RequestScoped;

/**
 * 类似我们请求的时候将值保存在此访问之中
 * @author bruce
 *
 */
@RequestScoped
public class RequstScope {

    
}

package cn.northpark.action;

import com.google.inject.Inject;
import com.google.inject.Provider;

public class RequstScopeTest {

    @Inject
    private Provider<RequstScope> requst=null;
    

    RequstScope a=requst.get();//通过此种方法去取此范围的值
    
}

2.@SessionScoped

例子如下:

package cn.northpark.action;

import com.google.inject.servlet.SessionScoped;

@SessionScoped
public class SessionScope {

    private int count=0;

    public int getCount() {
        return count;
    }

    public void setCount(int count) {
        this.count = count;
    }
    
    
}

package cn.northpark.action;

import com.google.inject.Inject;
import com.google.inject.Provider;

public class SessionScopeTest {

    @Inject
    private Provider<SessionScope> session=null;
    

    SessionScope a=session.get();//通过此种方法去取此范围的值
    
    void test(){
        a.setCount(2);
    }
}

3.@RequestParameters

例子如下:

@Inject
@RequestParameters
private Provider<Map<String, String[]>> reqParamMapProvider;

guice servlet 还是比较好用，如果你选择用servlet开发的时候建议用它了。