英文:
Get URL parameter using Spring
问题
我有一个Spring应用程序，我想在URL中设置参数并转发到URL。例如，我在index.html中点击“显示详情”。然后跳转到/employees/show/1111。ShowController.java获取到了1111。现在我点击“显示详情”，结果是白色页面错误。我设置了ShowController.java的断点，但断点无法工作。我应该在哪里修复它？
控制器
@Controller
@RequestMapping("/employees/show/{employee.empId}/")
public class ShowController {
@Autowired
EmployeeService empService;
@GetMapping
public String details(@RequestParam("empId") String empId, Model model) {
Employee employee = empService.getEmployeeInfo(Long.parseLong(empId)); // 在这一行设置断点
model.addAttribute("employee", employee);
return "view/show";
}
}
index.html
<body>
<table>
<tr>
<th>Id</th>
<th>Name</th>
<th></th>
</tr>
<tr th:each="employee : ${employees}">
<td th:text="${employee.empId}"></td>
<td th:text="${employee.empName}"></td>
<td><a th:href="@{'/employees/show/' + ${employee.empId}}">显示详情</a></td>
</tr>
</table>
<br>
</body>
show.html
<body>
<div th:text="${employee.empId}"></div>
<div th:text="${employee.empName}"></div>
</body>
文件夹结构。
英文:
I have Spring application,I want to set parameter in URL and forward to URL.
For example,I click "Show detail" in index.html.Then go to /employees/show/1111.
ShowController.java get 1111.Now I click "show detail",result is white page error.
And I set break point ShowController.java,break point cannot was not working.
Where I should fix it?
Controller
@Controller
@RequestMapping("/employees/show/{employee.empId}/")
public class ShowController {
@Autowired
EmployeeService empService;
@GetMapping
public String details(@RequestParam("empId") String empId, Model model) {
Employee employee = empService.getEmployeeInfo(Long.parseLong(empId)); // break point at this row
model.addAttribute("employee", employee);
return "view/show";
}
index.html
<body>
<table>
<tr>
<th>Id</th>
<th>Name</th>
<th></th>
</tr>
<tr th:each="employee : ${employees}">
<td th:text="${employee.empId}"></td>
<td th:text="${employee.empName}"></td>
<td><a th:href="@{'/employees/show/' + ${employee.empId}}">Show detail</a></td>
</tr>
</table>
<br>
</body>
show.html
<body>
<div th:text="${employee.empId}"></div>
<div th:text="${employee.empName}"></div>
</body>
This folder structure.
答案1
得分: 0
问题出在 URL 上。你正在使用 /employees/show/{employee.empId}/ 作为基本 URL。而 @GetMapping 没有映射到任何 URL，所以它会从 @RequestMapping("/employees/show/{employee.empId}/") 中获取完整的 URL。
@RequestParam 用于提取请求中的查询参数、表单参数，甚至文件；而 @PathVariable 则用于告诉 Spring，URI 路径的某一部分是要传递给方法的值。
所以，在你的情况下似乎出现了混淆，你使用了 @RequestParam 而不是 @PathVariable。
@Controller
@RequestMapping("/employees/show/{employee:.*}/") // 因为 Spring 会跳过点（.）后面的任何内容
....
@GetMapping
public String details(@PathVariable("empId") String empId, Model model) {....}
英文:
The problem is the url. You are using /employees/show/{employee.empId}/ as a base url. And @GetMappingis not mapped to any url, so it takes the exact url from @RequestMapping("/employees/show/{employee.empId}/").
@RequestParam is to extract query parameters, form parameters, and even files from the request, while @PathVariable is used to tell Spring that part of the URI path is a value you want passed to your method.
So, in your case it seems mixed, you are using @RequestParam instead of @PathVariable.
@Controller
@RequestMapping("/employees/show/{employee:.*}/") //since spring will skip anything after a dot(.)
....
@GetMapping
public String details(@PathVariable("empId") String empId, Model model) {....}
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