java Spring 不断返回字符串而不是 jsp/html 内容
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Spring keeps returning string instead of jsp/html content
提问by JustAName
I am trying to understand the whole Spring Framework. To my knowledge, the relatively new techniques of using gradle makes a lot of the tutorials and posts online outdated?
我试图了解整个 Spring 框架。据我所知，使用 gradle 的相对较新的技术使许多在线教程和帖子过时了？
The main issue that I am running in to is when I try to display a jsp or html page, the webpage's body shows text: "filename.jsp".
我遇到的主要问题是当我尝试显示 jsp 或 html 页面时，网页的正文显示文本：“filename.jsp”。
The project was created by New-> Other-> Spring Starter Project using Gradle and STS 3.7. The goal is to create a web application using MVC pattern.
该项目是由 New-> Other-> Spring Starter Project 使用 Gradle 和 STS 3.7 创建的。目标是使用 MVC 模式创建一个 Web 应用程序。
folder structure:
文件夹结构：
TEST
测试
--Spring Elements (created by STS)
--Spring 元素（由 STS 创建）
--src/main/java
++--TEST
++++--TestApplication.java (created by STS)
++--TEST.Controller
++++--JSPController.java
--src/main/java
++--TEST
++++--TestApplication.java（由STS创建）
++--TEST.Controller
++++--JSPController.java
--sec/main/resources
++--application.properties (created by STS , EMPTY file)
--sec/main/resources
++--application.properties（由 STS 创建，EMPTY 文件）
--src/main/webapp ( ** I created this directory, but is this required?)
++--WEB-INF
++++--home.jsp
++++--home.html
++++--web.xml (** Additional question below)
--src/main/webapp ( ** 我创建了这个目录，但这是必需的吗？)
++--WEB-INF
++++--home.jsp
++++--home.html
++++ --web.xml (** 下面的附加问题)
TestApplication.java
测试应用程序
package TEST;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class TestApplication {
public static void main(String[] args) {
SpringApplication.run(TestApplication.class, args);
}
}
home.jsp
主页.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>Test</title>
</head>
<body>
<h1>Test 1</h1>
<form>
First name:<br> <input type="text" name="firstname"> <br>
Last name:<br> <input type="text" name="lastname">
</form>
</body>
</html>
JSPController.java
JSPController.java
package TEST.controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class JSPController {
@RequestMapping(value = "/jsp", method = RequestMethod.GET)
public String home(){
return "/webapp/WEB-INF/home.jsp";
}
}
web.xml
网页.xml
//empty file right now
build.gradle
构建.gradle
buildscript {
ext {
springBootVersion = '1.2.5.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
classpath("io.spring.gradle:dependency-management-plugin:0.5.1.RELEASE")
}
}
apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'idea'
apply plugin: 'spring-boot'
apply plugin: 'io.spring.dependency-management'
jar {
baseName = 'TEST'
version = '0.0.1-SNAPSHOT'
}
sourceCompatibility = 1.8
targetCompatibility = 1.8
repositories {
mavenCentral()
}
dependencies {
compile("org.springframework.boot:spring-boot-starter-web")
testCompile("org.springframework.boot:spring-boot-starter-test")
}
eclipse {
classpath {
containers.remove('org.eclipse.jdt.launching.JRE_CONTAINER')
containers 'org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8'
}
}
task wrapper(type: Wrapper) {
gradleVersion = '2.3'
}
When I go to http://localhost:8080/jsp, the html page has the body: /webapp/WEB-INF/home.jsp
当我访问http://localhost:8080/jsp 时，html 页面的正文为：/webapp/WEB-INF/home.jsp
So the jsp is not displaying at all. I have tried html and with or without method=RequestMethod.GET/POST. Nothing works.
所以jsp根本不显示。我已经尝试过 html 和有或没有 method=RequestMethod.GET/POST。没有任何作用。
**Additional question: A lot of online posts/tutorial goes in to .xml files, for example, web.xml. To my understanding, these are no longer required or needed because spring + gradle generates a .xml automatically from the @notations?
**附加问题：很多在线帖子/教程都涉及 .xml 文件，例如 web.xml。据我了解，这些不再需要或不再需要，因为 spring + gradle 会从 @notations 自动生成 .xml？
回答by Marlon Bernardes
That's because you are using the annotation @RestControllerinstead of @Controller.
那是因为您使用的是注释@RestController而不是@Controller.
Change your class annotation from
将您的类注释从
@RestController
public class JSPController {
...
}
to:
到：
@Controller
public class JSPController {
...
}
When you annotate a class with RestController, all methods annotated with @RequestMappingassume @ResponseBodysemantics by default. In other words, your method #homeis serializing the String /webapp/WEB-INF/home.jspas JSON, instead of mapping its value to a view.
当你使用注解类RestController，带注释的所有方法@RequestMapping假设@ResponseBody默认语义。换句话说，您的方法#home将 String 序列化为/webapp/WEB-INF/home.jspJSON，而不是将其值映射到视图。
