struts2 json 插件 （与hibernate 关联对象）碰到的问题和处理

1.先上代码

BaseJsonAction.java

package com.jiang.action;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.struts2.convention.annotation.Action;
import org.apache.struts2.convention.annotation.Namespace;
import org.apache.struts2.convention.annotation.ParentPackage;
import org.apache.struts2.convention.annotation.Result;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Controller;

import com.jiang.entities.User;
import com.jiang.service.IUserService;
import com.opensymphony.xwork2.ActionSupport;
@SuppressWarnings("serial")
@Controller
@Scope("session")

@ParentPackage("json-default")
@Namespace("/user")
public class BaseJsonAction extends ActionSupport{

private Map<String,Object> dataMap;

public Map<String, Object> getDataMap() {
return dataMap;
}
public void setDataMap(Map<String, Object> dataMap) {
this.dataMap = dataMap;
}
@Autowired
private IUserService<User> userService;
@Action(value = "findAll",results = { @Result(name="success",type = "json")})
public String findAll() throws Exception {

dataMap = new HashMap<String,Object>();

List<User> userList = userService.findAll(User.class);

dataMap.put("success", true);

dataMap.put("userList", userList);
return SUCCESS;

}
}

2.浏览器中输入： http://localhost:8080/caroa/user/findAll.action

发现会提示异常：could not initialize proxy - no Session

然后打开debug模式

进去看了一下 出现了：com.sun.jdi.InvocationException occurred invoking method.这个异常



这边应该是lazy加载所产生的问题，在 hibernate.cfg.xml 中加入

<!-- 用于解决懒加载时找不到session的问题 -->
<!-- 关闭Load方法的延迟加载 -->
<property name="hibernate.enable_lazy_load_no_trans">true</property>

再debug 运行一下。 看见里边之前有异常的都有正常值了



3.F8 跳过 debug 发现又出异常了 ：org.apache.struts2.json.JSONException: java.lang.reflect.InvocationTargetException

控制台一看 所有有主外键关联的类 都去查了，好恐怖的输出。。。 (以下是 n分之一)

Hibernate: select cars0_.userid as userid13_2_0_, cars0_.id as id1_2_0_, cars0_.id as id1_2_1_, cars0_.back as back2_2_1_, cars0_.carName as carName3_2_1_, cars0_.dashboard as dashboar4_2_1_, cars0_.drivingLicense as drivingL5_2_1_, cars0_.front as front6_2_1_, cars0_.gpsMachine as gpsMachi7_2_1_, cars0_.incar as incar8_2_1_, cars0_.key as key9_2_1_, cars0_.left as left10_2_1_, cars0_.right as right11_2_1_, cars0_.type as type12_2_1_, cars0_.userid as userid13_2_1_ from caroa.car cars0_ where cars0_.userid=?
Hibernate: select idcard0_.id as id1_5_0_, idcard0_.back as back2_5_0_, idcard0_.front as front3_5_0_, idcard0_.number as number4_5_0_ from caroa.idcard idcard0_ where idcard0_.id=?
Hibernate: select users0_.idcardid as idcardid8_8_0_, users0_.id as id1_8_0_, users0_.id as id1_8_1_, users0_.address as address2_8_1_, users0_.age as age3_8_1_, users0_.idcardid as idcardid8_8_1_, users0_.mark as mark4_8_1_, users0_.name as name5_8_1_, users0_.password as password6_8_1_, users0_.picture as picture7_8_1_, users0_.typeid as typeid9_8_1_ from caroa.user users0_ where users0_.idcardid=?
Hibernate: select cars0_.userid as userid13_2_0_, cars0_.id as id1_2_0_, cars0_.id as id1_2_1_, cars0_.back as back2_2_1_, cars0_.carName as carName3_2_1_, cars0_.dashboard as dashboar4_2_1_, cars0_.drivingLicense as drivingL5_2_1_, cars0_.front as front6_2_1_, cars0_.gpsMachine as gpsMachi7_2_1_, cars0_.incar as incar8_2_1_, cars0_.key as key9_2_1_, cars0_.left as left10_2_1_, cars0_.right as right11_2_1_, cars0_.type as type12_2_1_, cars0_.userid as userid13_2_1_ from caroa.car cars0_ where cars0_.userid=?
Hibernate: select idcard0_.id as id1_5_0_, idcard0_.back as back2_5_0_, idcard0_.front as front3_5_0_, idcard0_.number as number4_5_0_ from caroa.idcard idcard0_ where idcard0_.id=?
Hibernate: select users0_.idcardid as idcardid8_8_0_, users0_.id as id1_8_0_, users0_.id as id1_8_1_, users0_.address as address2_8_1_, users0_.age as age3_8_1_, users0_.idcardid as idcardid8_8_1_, users0_.mark as mark4_8_1_, users0_.name as name5_8_1_, users0_.password as password6_8_1_, users0_.picture as picture7_8_1_, users0_.typeid as typeid9_8_1_ from caroa.user users0_ where users0_.idcardid=?
Hibernate: select cars0_.userid as userid13_2_0_, cars0_.id as id1_2_0_, cars0_.id as id1_2_1_, cars0_.back as back2_2_1_, cars0_.carName as carName3_2_1_, cars0_.dashboard as dashboar4_2_1_, cars0_.drivingLicense as drivingL5_2_1_, cars0_.front as front6_2_1_, cars0_.gpsMachine as gpsMachi7_2_1_, cars0_.incar as incar8_2_1_, cars0_.key as key9_2_1_, cars0_.left as left10_2_1_, cars0_.right as right11_2_1_, cars0_.type as type12_2_1_, cars0_.userid as userid13_2_1_ from caroa.car cars0_ where cars0_.userid=?
Hibernate: select idcard0_.id as id1_5_0_, idcard0_.back as back2_5_0_, idcard0_.front as front3_5_0_, idcard0_.number as number4_5_0_ from caroa.idcard idcard0_ where idcard0_.id=?
Hibernate: select users0_.idcardid as idcardid8_8_0_, users0_.id as id1_8_0_, users0_.id as id1_8_1_, users0_.address as address2_8_1_, users0_.age as age3_8_1_, users0_.idcardid as idcardid8_8_1_, users0_.mark as mark4_8_1_, users0_.name as name5_8_1_, users0_.password as password6_8_1_, users0_.picture as picture7_8_1_, users0_.typeid as typeid9_8_1_ from caroa.user users0_ where users0_.idcardid=?
Hibernate: select cars0_.userid as userid13_2_0_, cars0_.id as id1_2_0_, cars0_.id as id1_2_1_, cars0_.back as back2_2_1_, cars0_.carName as carName3_2_1_, cars0_.dashboard as dashboar4_2_1_, cars0_.drivingLicense as drivingL5_2_1_, cars0_.front as front6_2_1_, cars0_.gpsMachine as gpsMachi7_2_1_, cars0_.incar as incar8_2_1_, cars0_.key as key9_2_1_, cars0_.left as left10_2_1_, cars0_.right as right11_2_1_, cars0_.type as type12_2_1_, cars0_.userid as userid13_2_1_ from caroa.car cars0_ where cars0_.userid=?

这边我是这么处理的：（这里不需要关联表的属性，只要主表属性）找到User类，把关联表里边getX(）的 关系里边加上@JSON(serialize=false) 

继续运行：

看控制台，恩，只有1条语句输出。ok的。

继续看页面

页面也输出了我要的json：

贴图了：虽然很丑



搞定，收工~