Spring Security 与 Servlet 和 JSP 示例

约定不等于承诺〃 2023-09-27 10:54 126阅读 0赞

在这个例子中，我们将看到如何在 Java Servlet 和 JSP 应用程序中使用 Spring 安全性。我们将使用 Spring Web Security 进行内存身份验证。由于此 Web 应用程序将在 servlet 容器中运行，因此可以照常使用 JSP 和 Servlet。在这个例子中我们不会使用 Spring MVC。

### Maven 依赖项 ###

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>com.logicbig.example</groupId>
        <artifactId>spring-security-and-servlet-example</artifactId>
        <version>1.0-SNAPSHOT</version>
        <packaging>war</packaging>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.security</groupId>
                <artifactId>spring-security-web</artifactId>
                <version>4.2.3.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.security</groupId>
                <artifactId>spring-security-config</artifactId>
                <version>4.2.3.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>javax.servlet-api</artifactId>
                <version>3.1.0</version>
                <scope>provided</scope>
            </dependency>
            <dependency>
                <groupId>commons-logging</groupId>
                <artifactId>commons-logging</artifactId>
                <version>1.2</version>
            </dependency>
        </dependencies>
        <build>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-war-plugin</artifactId>
                    <configuration>
                        <failOnMissingWebXml>false</failOnMissingWebXml>
                    </configuration>
                </plugin>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.3</version>
                    <configuration>
                        <source>1.8</source>
                        <target>1.8</target>
                    </configuration>
                </plugin>
                <plugin>
                    <groupId>org.apache.tomcat.maven</groupId>
                    <artifactId>tomcat7-maven-plugin</artifactId>
                    <version>2.2</version>
                    <configuration>
                        <path>/</path>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    </project>

### Java 配置类 ###

package com.logicbig.example;
    
    import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
    import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
    import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
    
    @EnableWebSecurity
    public class AppConfig extends WebSecurityConfigurerAdapter {
    
        @Override
        public void configure(AuthenticationManagerBuilder builder)
                throws Exception {
            builder.inMemoryAuthentication()
                    .withUser("alexa")
                    .password("123")
                    .roles("USER");
        }
    }

### 初始化 Java 配置 ###

package com.logicbig.example;
    
    import org.springframework.security.web.context.AbstractSecurityWebApplicationInitializer;
    
    public class AppSecurityInitializer extends AbstractSecurityWebApplicationInitializer {
    
        public AppSecurityInitializer() {
            super(AppConfig.class);
        }
    }

### 一个 JSP 页面 ###

src/main/webapp/index.jsp

<html>
        <body>
            <h2>Welcome to App</h2>
            <p>
                <%=request.getUserPrincipal().getName().toString()%>
            </p>
            <a href="/example">Go to Example Servlet</a>
        </body>
    </html>

### 一个小服务程序 ###

package com.logicbig.example;
    
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    import java.io.PrintWriter;
    
    @WebServlet(name = "exampleServlet", urlPatterns = {"/example"})
    public class ExampleServlet extends HttpServlet {
    
        @Override
        protected void doGet(HttpServletRequest req,
                HttpServletResponse resp) throws ServletException, IOException {
    
            resp.setContentType("text/html");
            PrintWriter writer = resp.getWriter();
            String servletName = getServletConfig().getServletName();
            writer.println("handling request, servlet name: " + servletName);
            writer.println("<br/>");
            writer.println("user: " + req.getUserPrincipal().getName());
            writer.println("<br/><a href=\"/index.jsp\">Main Page</a>");
        }
    }

要尝试示例，请运行嵌入式 tomcat（在下面示例项目的 pom.xml 中配置）：

mvn tomcat7:run-war

### 输出 ###

第一次访问任何资源都会显示 Spring 认证表单：

![7d16e70b587f2d9e9543a51e667dfb0a.png][]

按照我们在 AppConfig 类中设置的方式提交用户名和密码后：

![15b45a254f9b898f61a17717a23291de.png][]

单击“转到示例 Servlet”链接：

![79c9b63429a9ce4adc1f365c5f726bf1.png][]

###  ###

[7d16e70b587f2d9e9543a51e667dfb0a.png]: https://img-blog.csdnimg.cn/img_convert/7d16e70b587f2d9e9543a51e667dfb0a.png
[15b45a254f9b898f61a17717a23291de.png]: https://img-blog.csdnimg.cn/img_convert/15b45a254f9b898f61a17717a23291de.png
[79c9b63429a9ce4adc1f365c5f726bf1.png]: https://img-blog.csdnimg.cn/img_convert/79c9b63429a9ce4adc1f365c5f726bf1.png