实现数据库查询用户，获取密码，编写了单元测试类

src/main/java/com/fjy/spring/Application.java

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+package com.fjy.spring;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Application {
+
+	public static void main(String[] args) {
+		SpringApplication.run(Application.class, args);
+	}
+}

src/main/java/com/fjy/spring/controller/LoginController.java

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+package com.fjy.spring.controller;
+
+import com.fjy.spring.domain.TbUser;
+import com.fjy.spring.service.UserService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+
+@Controller
+public class LoginController {
+
+    @Autowired
+    private UserService userService;
+
+    @GetMapping("/index")
+    public String toLoginPage(){
+        return "login";
+    }
+
+    @PostMapping("/login/dologin")
+    public boolean doLogin(TbUser tbUser){
+        if (userService.doLoginService(tbUser.getColname(),tbUser.getColpassword())){
+            return true;
+        }
+        return false;
+    }
+}

src/main/java/com/fjy/spring/controller/TestController.java

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+package com.fjy.spring.controller;
+
+import com.fjy.spring.domain.TbUser;
+import com.fjy.spring.repository.TbUserRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.List;
+
+@RestController
+public class TestController {
+
+    @Autowired
+    private TbUserRepository tbUserRepository;
+
+    @GetMapping("/test")
+    public String TestHello(){
+        return "Hello Spring";
+    }
+
+    @GetMapping("/test/name/{name}")
+    public String TestDataBase(@PathVariable("name") String name){
+        //TbUser user = (TbUser)tbUserRepository.findById(id).get();
+        TbUser user = (TbUser)tbUserRepository.findByColname(name).get();
+        return user.getColpassword();
+    }
+
+    @GetMapping("/test/id/{id}")
+    public String TestDataBaseId(@PathVariable("id") Integer id){
+        TbUser user = (TbUser)tbUserRepository.findById(id).get();
+        return user.toString();
+    }
+}

src/main/java/com/fjy/spring/domain/TbUser.java

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+package com.fjy.spring.domain;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+
+@Entity
+public class TbUser {
+    @Id
+    @GeneratedValue
+    private Integer coluserid;
+
+    private String colname;
+    private String colpassword;
+    private String colemail;
+    private String colstudentno;
+    private String colrealname;
+
+    public Integer getColuserid() {
+        return coluserid;
+    }
+
+    public void setColuserid(Integer coluserid) {
+        this.coluserid = coluserid;
+    }
+
+    public String getColname() {
+        return colname;
+    }
+
+    public void setColname(String colname) {
+        this.colname = colname;
+    }
+
+    public String getColpassword() {
+        return colpassword;
+    }
+
+    public void setColpassword(String colpassword) {
+        this.colpassword = colpassword;
+    }
+
+    public String getColemail() {
+        return colemail;
+    }
+
+    public void setColemail(String colemail) {
+        this.colemail = colemail;
+    }
+
+    public String getColstudentno() {
+        return colstudentno;
+    }
+
+    public void setColstudentno(String colstudentno) {
+        this.colstudentno = colstudentno;
+    }
+
+    public String getColrealname() {
+        return colrealname;
+    }
+
+    public void setColrealname(String colrealname) {
+        this.colrealname = colrealname;
+    }
+
+    @Override
+    public String toString() {
+        return "TbUser{" +
+                "coluserid=" + coluserid +
+                ", colname='" + colname + '\'' +
+                ", colpassword='" + colpassword + '\'' +
+                ", colemail='" + colemail + '\'' +
+                ", colstudentno='" + colstudentno + '\'' +
+                ", colrealname='" + colrealname + '\'' +
+                '}';
+    }
+}

src/main/java/com/fjy/spring/repository/TbUserRepository.java

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+package com.fjy.spring.repository;
+
+import com.fjy.spring.domain.TbUser;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.Optional;
+
+public interface TbUserRepository extends JpaRepository<TbUser,Integer> {
+
+    public Optional<TbUser> findByColname(String name);
+
+}

src/main/java/com/fjy/spring/service/UserService.java

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+package com.fjy.spring.service;
+
+import com.fjy.spring.domain.TbUser;
+import com.fjy.spring.repository.TbUserRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class UserService {
+
+    @Autowired
+    private TbUserRepository tbUserRepository;
+
+
+    public boolean doLoginService(String name,String password){
+        TbUser user = (TbUser)tbUserRepository.findByColname(name).get();
+        if (password.equals(user.getColpassword())){
+            return true;
+        }
+        return false;
+    }
+}