import java.awt.print.Printable;  import java.io.IOException;    import javax.servlet.http.HttpServletResponse;    import org.junit.Before;  import org.junit.Test;  import org.junit.runner.RunWith;  import org.springframework.beans.factory.annotation.Autowired;  import org.springframework.http.MediaType;  import org.springframework.test.context.ContextConfiguration;  import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;  import org.springframework.test.context.web.WebAppConfiguration;  import org.springframework.test.web.servlet.MockMvc;  import org.springframework.test.web.servlet.ResultHandler;  import org.springframework.test.web.servlet.ResultMatcher;  import org.springframework.ui.Model;  import org.springframework.test.context.transaction.TransactionConfiguration;  import org.springframework.transaction.annotation.Transactional;  import static org.springframework.test.web.servlet.result.MockMvcResultHandlers.*;  import static org.springframework.test.web.servlet.setup.MockMvcBuilders.*;  import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;  import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;  import org.springframework.web.bind.annotation.RequestMapping;  import org.springframework.web.bind.annotation.RequestMethod;  import org.springframework.web.context.WebApplicationContext;    @RunWith(SpringJUnit4ClassRunner.class)  @WebAppConfiguration  @ContextConfiguration(locations = { "classpath:applicationContext.xml" })  //当然 你可以声明一个事务管理 每个单元测试都进行事务回滚 无论成功与否  @TransactionConfiguration(defaultRollback = true)  //记得要在XML文件中声明事务哦~~~我是采用注解的方式  @Transactional  public class ExampleTests {        @Autowired      private WebApplicationContext wac;        private MockMvc mockMvc;        @Before      public void setup() {          // webAppContextSetup 注意上面的static import          // webAppContextSetup 构造的WEB容器可以添加fileter 但是不能添加listenCLASS          // WebApplicationContext context =          // ContextLoader.getCurrentWebApplicationContext();          // 如果控制器包含如上方法 则会报空指针          this.mockMvc = webAppContextSetup(this.wac).build();      }        @Test          //有些单元测试你不希望回滚          @Rollback(false)      public void ownerId() throws Exception {          mockMvc.perform((get("/spring/rest/4.do"))).andExpect(status().isOk())                  .andDo(print());      }        @Test      public void test() throws Exception {          mockMvc.perform((get("/spring/test.do"))).andExpect(status().isOk())                  .andDo(print())                  .andExpect(model().attributeHasNoErrors("teacher"));      }        @Test      public void testb() throws Exception {          mockMvc.perform((get("/spring/testb.do"))).andExpect(status().isOk())                  .andDo(print());      }        @Test      public void getAccount() throws Exception {          mockMvc.perform((post("/spring/post.do").param("abc", "def")))                  .andExpect(status().isOk()).andDo(print());      }    }