我使用Spring，Hibernate等在Java上创建了简单的CrUD应用程序。但是编辑操作并没有像我想象的那样工作。当我尝试edit主表中的任何一行时，我只得到空白字段，所以我无法编辑它们，我必须从头开始编写它们！这是entity class：
package com.alesto.taskmgr.entity;
import javax.persistence.*;
import java.io.Serializable;
@Entity
@Table(name="tasks")
public class Task implements Serializable,Comparable<Task> {
private static final long serialVersionUID = 100500L;
/**
* our data for mapping with annotations
*/
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private long id;
@Column
private String taskBody;
@Column
private boolean completion;
@Column
private boolean urgency;
//empty constructor
public Task() {}
/**
* getters and setters
*/
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getTaskBody() {
return taskBody;
}
public void setTaskBody(String taskBody) {
this.taskBody = taskBody;
}
public boolean isCompletion() {
return completion;
}
public void setCompletion(boolean completion) {
this.completion = completion;
}
public boolean isUrgency() {
return urgency;
}
public void setUrgency(Boolean urgency) {
this.urgency = urgency;
}
@Override
public String toString() {
String completed = completion == true ? "Completed" : "Active";
String urgent = urgency == true ? "!!!" : "";
return "("+urgent+completed+") "+this.taskBody;
}
@Override
public int compareTo(Task o) {
int n1 = this.isCompletion() ? 1 : 0;
int n2 = o.isCompletion() ? 1 : 0;
int n3 = n1-n2;
if(n3 == 0) {
return this.taskBody.compareTo(o.taskBody);
} else {
return n3;
}
}
}
我试图用Controller class
package com.alesto.taskmgr.controller;
import com.alesto.taskmgr.entity.Task;
import com.alesto.taskmgr.service.TaskService;
import org.jboss.logging.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;
import java.util.*;
@Controller
public class TaskController {
private static final Logger logger = Logger.getLogger(TaskController.class);
private static Appearance appearance = Appearance.FULL;
public TaskController() {
System.out.println("TaskController()");
}
@Autowired
private TaskService taskService;
@RequestMapping("createTask")
public ModelAndView createTask(@ModelAttribute Task task) {
logger.info("Creating Task. Data: " + task);
return new ModelAndView("taskForm");
}
@RequestMapping("editTask")
public ModelAndView editTask(@RequestParam long id, @ModelAttribute Task task) {
logger.info("Updating the Task for the Id "+id);
task = taskService.getTask(id);
return new ModelAndView("taskForm", "taskObject", task);
}
@RequestMapping("saveTask")
public ModelAndView saveTask(@ModelAttribute Task task) {
logger.info("Saving the Task. Data : " + task);
if(task.getId() == 0){ // if task id is 0 then creating the task other updating the task
taskService.createTask(task);
} else {
taskService.updateTask(task);
}
return redirection();
}
@RequestMapping("deleteTask")
public ModelAndView deleteTask(@RequestParam long id) {
logger.info("Deleting the Task. Id : " + id);
taskService.deleteTask(id);
return redirection();
}
public ModelAndView redirection() {
switch(appearance) {
case FULL:
return new ModelAndView("redirect:getAllTasks");
case ONLY_ACTIVE:
return new ModelAndView("redirect:getOnlyActive");
case ONLY_DONE:
return new ModelAndView("redirect:getOnlyDone");
default:
return new ModelAndView("redirect:getAllTasks");
}
}
@RequestMapping(value = {"getAllTasks", "/"})
public ModelAndView getAllTasks() {
logger.info("Getting the all Tasks.");
List<Task> taskList = taskService.getAllTasks();
Collections.sort(taskList);
return new ModelAndView("taskList", "taskList", taskList);
}
@RequestMapping(value = {"getOnlyActive"})
public ModelAndView getOnlyActive() {
logger.info("Getting only active Tasks.");
List<Task> taskList = taskService.getAllTasks();
List<Task> result = new ArrayList<Task>();
for (Task task : taskList) {
if(!task.isCompletion()) {
result.add(task);
}
}
return new ModelAndView("taskList", "taskList", result);
}
@RequestMapping(value = {"getOnlyDone"})
public ModelAndView getOnlyDone() {
logger.info("Getting only done Tasks.");
List<Task> taskList = taskService.getAllTasks();
List<Task> result = new ArrayList<Task>();
for (Task task : taskList) {
if(task.isCompletion()) {
result.add(task);
}
}
return new ModelAndView("taskList", "taskList", result);
}
}
这就是jsp page，我试图将mysql的数据转换为input form的默认值。
<%--suppress ALL --%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" >
<title>Task Editor</title>
</head>
<body>
<form:form id="taskRegisterForm" modelAttribute="task" method="post" action="saveTask">
<form:label path="taskBody" >Write or specify your task</form:label><br>
<form:hidden path="id" value="${taskObject.id}"/>
<form:textarea cols="100" rows="6" path="taskBody" value="${taskObject.taskBody}"/><br><hr>
<form:label path="completion">Completion</form:label>
<form:checkbox path="completion" value="${taskObject.completion}"/><br>
<form:label path="urgency">Urgency</form:label>
<form:checkbox path="urgency" value="${taskObject.urgency}"/><br>
<input type="submit" id="saveTask" value="Save" onclick="return submitTaskForm();"/>
</form:form>
<script type="text/javascript">
function submitTaskForm() {
// checking if conditions are satisfied
var taskBody = $('#taskBody').val().trim();
if(taskBody.length == 0) {
alert('Please, enter at least something! :)');
$('#taskBody').focus();
return false;
}
return true;
};
</script>
</body>
</html>
在上面的form我尝试这样的结构： value =＆＃34; $ {taskObject.completion}＆＃34; 但它没有＆＃39;工作。
告诉我是否有必要从项目中添加其他代码。谢谢！