在 Struts2 中填充来自 URL 的 Action class 实例变量

Question

在将值从我的 html 表单传递到操作 class 时遇到问题。创建了一个示例项目来测试功能并在此处遇到相同的问题。我有以下 classes:

测试对象

package com.struts2test.beans;

public class TestBean {
    private String value;

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }
}

TestBeanHolder

package com.struts2test.beans;

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

public class TestBeanHolder {
    private Map<Integer, TestBean> testBeanMap;
    private List<TestBean> testBeanList;
    private Map<Integer, List<TestBean>> testBeanListMap;

    public Map<Integer, TestBean> getTestBeanMap() {
        return testBeanMap;
    }
    public void setTestBeanMap(Map<Integer, TestBean> testBeanMap) {
        this.testBeanMap = testBeanMap;
    }
    public Map<Integer, List<TestBean>> getTestBeanListMap() {
        return testBeanListMap;
    }
    public void setTestBeanListMap(Map<Integer, List<TestBean>> testBeanListMap) {
        this.testBeanListMap = testBeanListMap;
    }
    public List<TestBean> getTestBeanList() {
        return testBeanList;
    }
    public void setTestBeanList(List<TestBean> testBeanList) {
        this.testBeanList = testBeanList;
    }
}

测试动作

package com.struts2test.action;

import com.opensymphony.xwork2.ActionSupport;
import com.struts2test.beans.TestBeanHolder;

public class TestAction extends ActionSupport {

    private static final long serialVersionUID = 1L;
    private TestBeanHolder testBeanHolder;

    public TestBeanHolder getTestBeanHolder() {
        return testBeanHolder;
    }

    public void setTestBeanHolder(TestBeanHolder testBeanHolder) {
        this.testBeanHolder = testBeanHolder;
    }

    public String execute() throws Exception {
        return SUCCESS;
    }
}

当我的 url 是 http://localhost:8080/Struts2Test/test?testBeanHolder.testBeanMap[0].value=1 时，我的操作的 testBeanHolder.testBeanMap 会填充 0 映射到 TestBean 实例 [=20] =].

当 url 为 http://localhost:8080/Struts2Test/test?testBeanHolder.testBeanList[0].value=1 时，testBeanHolder.testBeanList 会填充 TestBean 和 value=1 的单个实例。

我尝试填充 testBeanListMap 属性的 testBeanHolder，但没有用。 testBeanListMap 已创建但为空。这是 URL 我正在尝试 http://localhost:8080/Struts2Test/test?testBeanHolder.testBeanListMap[0][0].value=1

Answer 1

表达式 testBeanHolder.testBeanListMap[0][0].value 不是有效的 OGNL 表达式。

有关允许的内容的完整参考，请参阅 here。

Answer 2

url http://localhost:8080/Struts2Test/test?testBeanHolder.testBeanListMap[0][0].value=1 将不起作用，因为您使用了错误的参数名称。因此 testBeanHolder.testBeanListMap[0][0].value 是映射到对象的参数名称，该对象具有复杂类型（集合的集合）的属性。 Struts2 无法处理这种情况，。但是您可以用一个对象包装第二个集合并使用对象集合。名称将更改为 testBeanHolder.testBeanListMap[0].object[0].value.

Answer 3

这是有效的代码，添加修改后的类:

TestBeanListHolder

package com.struts2test.beans;

import java.util.List;

public class TestBeanListHolder {
    private List<TestBean> testBeans;

    public List<TestBean> getTestBeans() {
        return testBeans;
    }

    public void setTestBeans(List<TestBean> testBeans) {
        this.testBeans = testBeans;
    }

}

TestBeanHolder

package com.struts2test.beans;

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

public class TestBeanHolder {
    private Map<Integer, TestBean> testBeanMap;
    private List<TestBean> testBeanList;
    private Map<Integer, TestBeanListHolder> testBeanListMap;

    public Map<Integer, TestBean> getTestBeanMap() {
        return testBeanMap;
    }

    public void setTestBeanMap(Map<Integer, TestBean> testBeanMap) {
        this.testBeanMap = testBeanMap;
    }

    public Map<Integer, TestBeanListHolder> getTestBeanListMap() {
        return testBeanListMap;
    }

    public void setTestBeanListMap(
            Map<Integer, TestBeanListHolder> testBeanListMap) {
        this.testBeanListMap = testBeanListMap;
    }

    public List<TestBean> getTestBeanList() {
        return testBeanList;
    }

    public void setTestBeanList(List<TestBean> testBeanList) {
        this.testBeanList = testBeanList;
    }
}

URL

http://localhost:8080/Struts2Test/test?testBeanHolder.testBeanListMap[1].testBeans[0].value=somevalue

在 Struts2 中填充来自 URL 的 Action class 实例变量

Populating Action class instance variables from URL in Struts2

java

struts2

ognl

测试对象

TestBeanHolder

测试动作

TestBeanListHolder

TestBeanHolder

URL