spring boot 拦截器实现拦截前端请求并返回json至前端页面

 

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拦截器主体

1. import com.alibaba.fastjson.JSONObject;

2. import com.ufclub.vis.constant.StatusConstant;

3. import com.ufclub.vis.entity.BaseResult;

4. import com.ufclub.vis.entity.admin.order.OrderInfo;

5. import com.ufclub.vis.service.admin.order.OrderInfoService;

6. import org.slf4j.Logger;

7. import org.slf4j.LoggerFactory;

8. import org.springframework.beans.factory.annotation.Autowired;

9. import org.springframework.stereotype.Component;

10. import org.springframework.web.servlet.HandlerInterceptor;

11. import org.springframework.web.servlet.ModelAndView;

12.  

13. import javax.servlet.http.HttpServletRequest;

14. import javax.servlet.http.HttpServletResponse;

15. import java.io.IOException;

16. import java.io.PrintWriter;

17.  

18. /**

19. * Created by tangzw on 2018/9/6 0006.

20. * 拦截订单超过48小时后需要返回首页

21. */

22. @Component

23. public class RepeatInterceptor implements HandlerInterceptor {

24.  

25. private Logger logger = LoggerFactory.getLogger(this.getClass());

26.  

27. //拦截发起视频和确认签订

28. private static final String[] requestUrls = new String[]{"/front/video/callVideo/", "/front/sign/doSign/"};

29.  

30. @Autowired

31. private OrderInfoService orderInfoService;

32.  

33. @Override

34. public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object o) throws Exception {

35.  

36. boolean ajaxFlag = false;

37. if (request.getHeader("x-requested-with") != null && request.getHeader("x-requested-with").equalsIgnoreCase("XMLHttpRequest")) {

38. ajaxFlag = true;

39. }

40. String requestURI = request.getRequestURI();

41. String orderIdStr = null;

42. if (requestURI != null) {

43. for (String url : requestUrls) {

44. if (requestURI.indexOf(url) != -1) {

45. orderIdStr = requestURI.substring(requestURI.indexOf(url) + url.length());

46. char[] chars = orderIdStr.toCharArray();

47. for (int i = 0; i < chars.length; i++) {

48. if (!Character.isDigit(chars[i])) {

49. orderIdStr = orderIdStr.substring(0, i);

50. break;

51. }

52. }

53. }

54. }

55.  

56. if (orderIdStr != null) {

57. Integer orderId;

58. try {

59. orderId = Integer.parseInt(orderIdStr);

60. } catch (Exception e) {

61. logger.error("状态拦截器订单id转换异常,orderId:" + orderIdStr + ",链接:" + requestURI, e);

62. return false;

63. }

64.  

65. //查询订单状态

66. OrderInfo orderInfo = orderInfoService.selectByPrimaryKey(orderId);

67. //订单是否已经回到身份验证

68. if (StatusConstant.ORDER_VERIFY_IDCARD.equals(orderInfo.getStatus())){

69. logger.error("状态拦截器订单已超过48小时，回到身份验证状态,orderId:" + orderIdStr + ",链接:" + requestURI);

70. //if (ajaxFlag){

71. // response.setHeader("orderStatus", "expire");

72. //}else {

73. // response.sendRedirect(expireUrl);

74. //}

75. //return false;

76. BaseResult baseResult = new BaseResult();

77. baseResult.setCode(0);

78. baseResult.setMessage("订单状态变更，请重新操作");

79. baseResult.setData(StatusConstant.ORDER_VERIFY_IDCARD);

80. String jsonObjectStr = JSONObject.toJSONString(baseResult);

81. returnJson(response,jsonObjectStr);

82. return false;

83. }

84. }

85. }

86. return true;

87. }

88.  

89. private void returnJson(HttpServletResponse response, String json) throws Exception{

90. PrintWriter writer = null;

91. response.setCharacterEncoding("UTF-8");

92. response.setContentType("text/html; charset=utf-8");

93. try {

94. writer = response.getWriter();

95. writer.print(json);

96.  

97. } catch (IOException e) {

98. logger.error("response error",e);

99. } finally {

100. if (writer != null)

101. writer.close();

102. }

103. }

104.  
105.  
106.  

107. @Override

108. public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {

109.  

110. }

111.  

112. @Override

113. public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {

114.  

115. }

116. }

前端页面接收（原请求ajax，不需要新建）

1. $.ajax({

2. url: "",

3. type: 'POST',

4. data: {"status" : "VIDEO"},

5. dataType: 'json',

6. success: function (data){

7. if (data.code == 0) {

8. layer.msg( data.message, {time : 3500}, function(){

9. window.location.href = "/front/index";

10. });

11. } else {

12. layer.msg( data.message, {time : 3500}, function(){});

13. }

14. }

15. });

启用拦截器

1. import com.ufclub.vis.web.interceptor.AutoLoginInterceptor;

2. import com.ufclub.vis.web.interceptor.OrderStatusInterceptor;

3. import com.ufclub.vis.web.interceptor.RepeatInterceptor;

4. import org.springframework.beans.factory.annotation.Autowired;

5. import org.springframework.context.annotation.Configuration;

6. import org.springframework.web.servlet.config.annotation.InterceptorRegistry;

7. import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

8.  
9.  

10. @Configuration

11. public class IntercpetorConfig extends WebMvcConfigurerAdapter {

12.  
13.  
14.  

15. @Autowired

16. private RepeatInterceptor repeatInterceptor;

17.  

18. @Override

19. public void addInterceptors(InterceptorRegistry registry) {

20. registry.addInterceptor(repeatInterceptor).addPathPatterns("/front/**");

21. }

22. }