springboot学习笔记三

@RestController

package da.test;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.PostMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.RestController;/** * @GetMapping 与 @PostMapping *             为spring4.3的新特性，访问请求必须为get或者post，代替了@RequestMapping后面的method中请求 * @RestController 加了这个就不需要@ResponseBody了 */@RestControllerpublic class UserController {    @RequestMapping("/user/home")    public String home() {        return "user home";    }    @GetMapping("/user/show")    public String show(@RequestParam("username") String username, @RequestParam("password") String password) {        return "user show " + username + ":" + password;    }    @PostMapping("/user/create")    public String create() {        return "user create";    }    @GetMapping("/user/showid/{id}")    public String showid(@PathVariable("id") Integer id) {        return "user show id:" + id;    }}

springboot使用jsp：

1 在配置文件中加入

#springboot使用jspspring.mvc.view.prefix=/WEB-INF/jsps/spring.mvc.view.suffix=.jsp

2 在pom文件中加入相关jar包

<!-- springboot默认不支持jsp,开启支持jsp的组建 --><dependency>    <groupId>org.apache.tomcat.embed</groupId>    <artifactId>tomcat-embed-jasper</artifactId></dependency>

3 jsp文件放在src/main/webapp文件夹下面

4 如果要使用jsp则不能使用@RestController

package da.test;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestParam;@Controllerpublic class LoginController {    @GetMapping("/login")    public String show(@RequestParam("username") String username, @RequestParam("password") String password) {        if (username.equals(password))            return "ok";        return "fail";    }    @GetMapping("/login2")    public String show(Model model) {        model.addAttribute("username", "root");        return "login";    }}

springboot使用freemarker：

1 pom文件中加入依赖

<!-- springboot中的freemarker --><dependency>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-freemarker</artifactId></dependency>

2 Freemarker存放在templates中

package da.test;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.GetMapping;@Controllerpublic class FreemarkerTest {    @GetMapping("reg")    public String reg() {        return "reg";    }    @GetMapping("fmlogin")    public String fmlogin(Model model) {        model.addAttribute("username", "root");        return "login";    }}

springboot使用jetty服务器启动：

需要修改pom依赖

<dependency>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-web</artifactId>    <!-- 排除tomcat依赖 加入jetty -->    <exclusions>        <exclusion>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-tomcat</artifactId>        </exclusion>    </exclusions></dependency><dependency>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-jetty</artifactId></dependency>

拦截器配置：

package da.test;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;public class LoginInterceptor implements HandlerInterceptor {    @Override    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)            throws Exception {        System.out.println("======preHandle=======" + handler.getClass());        return true;    }    @Override    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,            ModelAndView modelAndView) throws Exception {        System.out.println("======postHandle=======");    }    @Override    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)            throws Exception {        System.out.println("======afterCompletion=======");    }}

package da.test;import org.springframework.boot.SpringBootConfiguration;import org.springframework.web.servlet.config.annotation.InterceptorRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;@SpringBootConfigurationpublic class InterceptorConfiguration extends WebMvcConfigurerAdapter {    public void addInterceptors(InterceptorRegistry registry) {        registry.addInterceptor(new LoginInterceptor());    }}

异常处理：

先要关闭默认错误处理@SpringBootApplication(exclude=ErrorMvcAutoConfiguration.class)

1 错误页面的处理

package da.test;import org.springframework.boot.web.servlet.ErrorPage;import org.springframework.boot.web.servlet.ErrorPageRegistrar;import org.springframework.boot.web.servlet.ErrorPageRegistry;import org.springframework.http.HttpStatus;//@Componentpublic class CommonErrorPageRegistrar implements ErrorPageRegistrar {    @Override    public void registerErrorPages(ErrorPageRegistry registry) {        ErrorPage e404 = new ErrorPage(HttpStatus.NOT_FOUND, "/404.html");        ErrorPage e500 = new ErrorPage(HttpStatus.INTERNAL_SERVER_ERROR, "/500.html");        registry.addErrorPages(e404, e500);    }}

2 控制器中的异常

package da.test;import java.io.FileNotFoundException;import org.springframework.web.bind.annotation.ExceptionHandler;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class TestController02 {    @RequestMapping("/interceptor/login")    public String login() {        System.out.println("============login=========");        return "login";    }    @GetMapping("/user/help")    public String help() {        throw new IllegalArgumentException("出异常啦！");    }    @ExceptionHandler(value = Exception.class)    public String error(Exception e) {        return "exception:" + e.getMessage();    }    @GetMapping("/user/error1")    public String error1() throws FileNotFoundException {        throw new FileNotFoundException("出异常啦1！");    }    @GetMapping("/user/error2")    public String error2() throws ClassNotFoundException {        throw new ClassNotFoundException("出异常啦2！");    }}

3 全局异常处理

package da.test;import org.springframework.web.bind.annotation.ControllerAdvice;import org.springframework.web.bind.annotation.ExceptionHandler;import org.springframework.web.bind.annotation.ResponseBody;@ControllerAdvicepublic class GlobalExceptionHandler {    @ExceptionHandler(Exception.class)    @ResponseBody    public String errorHandler(Exception e) {        return "globel exception:" + e.getClass().getName();    }}

Tomcat的一些配置：

#设置访问地址与访问端口#server.address=192.168.1.104#server.port=8888#开启tomcat的日志功能#server.tomcat.accesslog.enabled=true#server.tomcat.accesslog.directory=e:/tmp/logs#server.tomcat...开启其他tomcat的功能

其他内容：

#指定启动端口，默认8080server.port=8888

springboot默认静态资源的路径:
classpath:[/WEB-INF/resources/,/resources/,/static/,/public/]可以通过spring.resources.staticLocations配置项修改默认静态资源的路径