java400报错[通俗易懂]

大家好，又见面了，我是你们的朋友全栈君。

页面报400，控制台没输出也没报错，原来是数据库中的date类型，和实体的字段冲突。

获取到页面的时间，转换成date类型，在给实体date类型属性赋值。

报has an unsupported return type: class java.lang.String===》在dao层写add方法时，疏忽了，写了String的返回类型

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;

import com.six.model.In_out_come;
import com.six.service.InOutService;
import com.six.utils.LogerUtil;
import com.six.utils.Pagenation;

@Controller
public class InOutController {
	@Autowired
	private InOutService ios;
	@RequestMapping("/getAllInOut")
	public ModelAndView getAllInOut(@RequestParam(defaultValue = "1") int page, HttpServletResponse re) {
		// try {
		// re.getWriter().println("<script>alert('OK，呵呵')</script>");
		// } catch (IOException e) {
		// // TODO Auto-generated catch block
		// e.printStackTrace();
		// }
		ModelAndView mm = new ModelAndView("html/right2ffy");
		int count = ios.getInOutCount();
		int pageNuM = 0;
		page = Pagenation.judgePage(page, count, pageNuM);
		int page1 = (page-1)*2;//拼接sql分页
		List<Map<String, Object>> list = ios.getAllInOut(page1);
		mm.addObject("list", list);
		mm.addObject("page", page);
		mm.addObject("count", count);
		LogerUtil.logMessage("收支流水信息：" + list);

		return mm;
	}

	@RequestMapping("/addinout")
	public String addinout(In_out_come inout, String date) throws ParseException { //获取页面date

		System.out.println(date);
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
		inout.setIn_made_date(sdf.parse(date));                        //转为date类型
		
		try {

			ios.addinout(inout);
			LogerUtil.logMessage("新增成功");
		} catch (Exception e) {
			// TODO: handle exception
			LogerUtil.logerror(e.toString());
		}

		return "redirect:getAllInOut.do";
	}
}

400报错！