为什么我在<s:select list="">无法显示属性的值，显示的是对象的地址

Z时代
2024-01-10
分类：IT

DepartmentDao.java

package com.service;
import com.entities.Department;
import java.util.List;
public class DepartmentDao extends BaseDao {
    public List<Department> getAll() {
        String hql = "from Department";
        return getSession().createQuery(hql).list();
    }
}

DepartmentService.java

package com.service;
import com.entities.Department;
import java.util.List;
public class DepartmentService {
    private DepartmentDao departmentDao;
    public void setDepartmentDao(DepartmentDao departmentDao) {
        this.departmentDao = departmentDao;
    }
    public List<Department> getAll() {
        return departmentDao.getAll();
    }
}

action.java

package com.actions;
import com.opensymphony.xwork2.ActionSupport;
import com.service.DepartmentService;
import com.service.EmployeeService;
import org.apache.struts2.interceptor.RequestAware;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.Map;
public class EmployeeAction extends ActionSupport implements RequestAware {
    private EmployeeService employeeService;
    private DepartmentService departmentService;
    private InputStream inputStream;
    private Map<String, Object> request;
    private Integer id;
    public InputStream getInputStream() {
        return inputStream;
    }
    public void setDepartmentService(DepartmentService departmentService) {
        this.departmentService = departmentService;
    }
    public void setEmployeeService(EmployeeService employeeService) {
        this.employeeService = employeeService;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String list() {
        request.put("employee", employeeService.getAll());
        return "list";
    }
//这里赋值给request了，怎么获取不到实际的内容呢？
    public String input() {
        request.put("departments", departmentService.getAll());
        return "input";
    }
    public String delete() {
        try {
            employeeService.delete(id);
            inputStream = new ByteArrayInputStream("1".getBytes("UTF-8"));
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            try {
                inputStream = new ByteArrayInputStream("0".getBytes("UTF-8"));
            } catch (UnsupportedEncodingException e1) {
                e1.printStackTrace();
            }
        }
        return "delete";
    }
    @Override
    public void setRequest(Map<String, Object> map) {
        this.request = map;
    }
}

jsp：

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h4>Employee Input info</h4>
<s:debug></s:debug>
<s:form action="emp-save" method="post">
    <s:textfield name="lastname" label="lastName"></s:textfield>
    <s:textfield name="email" label="Email"></s:textfield>
    <s:textfield name="birth" label="Birth"></s:textfield>
    <s:textfield name="createtime" label="Createtime"></s:textfield>
    <%--这里为什么获取的是地址呢？--%>
    <s:select list="#request.departments" listkey="id" listvalue="department.departmentname" label="Department" name="department.id">
    </s:select>
    <s:submit></s:submit>
</s:form>
<%--这里对比的，这里能够获取value="#request.departments--%>
<table border="1" cellpadding="2" cellspacing="0">
    <tr>
        <td>ID</td>
        <td>DEPARTMENT</td>
    </tr>
    <s:iterator value="#request.departments">
        <tr>
            <td>${id}</td>
            <td>${departmentname}</td>
        </tr>
    </s:iterator>
</table>
</body></html>