搭建一个springboot工程测试md5加密

1、展示搭建本次测试所用的springboot工程结构

其中，TestController模拟的是服务端接收post请求，TestMD5模拟的是客户端使用单元测试发送http请求

2、展示pom.xml文件

    4.0.0

    com.csii.test
    md5
    1.0-SNAPSHOT

    
        org.springframework.boot
        spring-boot-starter-parent
        1.5.2.RELEASE
        
    
    
        UTF-8
        UTF-8
        1.8
    

    
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.apache.httpcomponents
            httpclient
            4.5.2
        
    

3、StartSpringBoot为常规的启动类

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class StartSpringBoot {

    public static void main(String[] args) {
        SpringApplication.run(StartSpringBoot.class, args);
    }
}

4、MD5工具类

import java.security.MessageDigest;

public class MD5Utils {

    public static String strMD5ByUTF8(String originString){
        if (originString != null) {
            try {
                MessageDigest md= MessageDigest.getInstance("MD5");
                byte[] results=md.digest(originString.getBytes("UTF-8"));
                String resultString=byteArrayToHexString(results);
                return resultString.toUpperCase();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return null;
    }
    private static String byteArrayToHexString(byte[] b) {
        StringBuffer resultSb=new StringBuffer();
        for (int i = 0; i < b.length; i ++){
            resultSb.append(byteToHexString(b[i]));
        }
        return resultSb.toString();
    }
    private static String byteToHexString(byte b) {
        int n=b;
        if(n<0){
            n=256+n;
        }
        int d1=n/16;
        int d2=n%16;
        return hexDigits[d1]+hexDigits[d2];
    }
    private final static String[] hexDigits={"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"};
}

5、TestMD5采用的是httpclient对象来向服务端发送post请求

import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.junit.Test;

import java.io.IOException;

public class TestMD5 {

    @Test
    public void sendMD5Data(){

        CloseableHttpClient httpClient = HttpClientBuilder.create().build();
        CloseableHttpResponse response = null;
        try {
            // 创建Post请求
            String sendUrl = "http://localhost:8080/testMD5";
            HttpPost httpPost = new HttpPost(sendUrl);

            // 处理MD5加密分别获取到明文串和密文串
            String plainText = "testMD5"; // 明文串
            String key = "key"; // 秘钥
            String keyPlainText = key + plainText; // 组装成要加密的串
            MD5Utils md5Utils = new MD5Utils();
            String cipherText   = md5Utils.strMD5ByUTF8(keyPlainText); // 密文串

            System.out.println("客户端本次上送的明文串为：" + plainText + "，本次上送的密文串为：" + cipherText);

            // 将原明文串放入请求体中
            StringEntity entity = new StringEntity(plainText, "UTF-8");
            httpPost.setEntity(entity);
            // 设置ContentType
            httpPost.setHeader("Content-Type", "text/html;charset=utf8");
            // 将密文串放入到请求头中
            httpPost.setHeader("sign", cipherText);

            // 发送post请求
            response = httpClient.execute(httpPost);
            System.out.println("获取响应状态为:" + response.getStatusLine());

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                // 释放资源
                if (httpClient != null) {
                    httpClient.close();
                }
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

6、TestController模拟的是服务端接收请求

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

import javax.servlet.http.HttpServletRequest;


@Controller
public class TestController {

    @RequestMapping(value = "testMD5", method = RequestMethod.POST)
    @ResponseBody
    public void test(HttpServletRequest request, @RequestBody String plainText){
        // 从请求头中获取签名串
        String sign = request.getHeader("sign");
        System.out.println("服务端本次获取的明文串为：" + plainText + "，本次上送的密文串为：" + sign);
        // 约定的秘钥
        String key = "key";
        // 组装成待加密的串
        String keyPlainText = key + plainText;
        // 将keyPlainText进行MD5加密
        MD5Utils md5Utils = new MD5Utils();
        String cipherText = md5Utils.strMD5ByUTF8(keyPlainText); // 密文串
        // 将再次MD5加密后获得的密文串与上送的密文串做比较，如果完全一致，则证明此次传输数据成功
        boolean result = sign.equals(cipherText);
        System.out.println("此次传输数据结果：" + result);
    }
}

7、执行顺序，先执行StartSpringBoot将项目启动起来，然后再run  TestMD5类

TestMD5的控制台打印结果，打印比较多，我只展示了本次需要的日志

客户端本次上送的明文串为：testMD5,本次上送的密文串为：B5B94ED2D2D375450196E6DC5AB9DE69
获取响应状态为:HTTP/1.1 200

服务器端展示结果：

服务端本次获取的明文串为：testMD5,本次上送的密文串为：B5B94ED2D2D375450196E6DC5AB9DE69
此次传输数据结果：true

可以发现本次两次MD5之后得到的串是一致的，证明本次传输数据成功，没有被篡改。