1. 什么是跨域 跨域指兩個不同系統之間的訪問、呼叫，如 （1）域名不同，即兩個不同的應用，
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);
指定異步請求為jsonp方式， <script type="text/javascript"> function testajax(){ $.ajax({ url:"http://localhost:8081/category.json", type: "GET", dataType: "jsonp", //jsonp請求 jsonp:"callbackFunction", //請求引數名 jsonpCallback:"showData", //回呼函式名稱，需與用來包裝的函式名一致 success: function (data) { $("#text").val(JSON.stringify(data)); } }); } </script>
5.結論 （1）jsonp是ajax技術中的一種異步請求方式 （2）jsonp能實作跨越請求， （3）jsonp跨越時，需要指定一個回呼函式，并使用該函式將回傳的資料偽裝成js腳本， （4）獲取回傳的js腳本后，jsonp自動提取其中的json資料， 6.json包裝成js jackson 物件與json字串轉換工具類：
package com.gjs.ego.base.utils; import java.util.List; import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.databind.JavaType; import com.fasterxml.jackson.databind.ObjectMapper; public class JsonUtils { // 定義jackson物件 private static final ObjectMapper MAPPER = new ObjectMapper(); /** * 將物件轉換成json字串， * <p>Title: pojoToJson</p> * <p>Description: </p> * @param data * @return */ public static String objectToJson(Object data) { try { String string = MAPPER.writeValueAsString(data); return string; } catch (JsonProcessingException e) { e.printStackTrace(); } return null; } /** * 將json結果集轉化為物件 * * @param jsonData json資料 * @param clazz 物件中的object型別 * @return */ public static <T> T jsonToPojo(String jsonData, Class<T> beanType) { try { T t = MAPPER.readValue(jsonData, beanType); return t; } catch (Exception e) { e.printStackTrace(); } return null; } /** * 將json資料轉換成pojo物件list * <p>Title: jsonToList</p> * <p>Description: </p> * @param jsonData * @param beanType * @return */ public static <T>List<T> jsonToList(String jsonData, Class<T> beanType) { JavaType javaType = MAPPER.getTypeFactory().constructParametricType(List.class, beanType); try { List<T> list = MAPPER.readValue(jsonData, javaType); return list; } catch (Exception e) { e.printStackTrace(); } return null; } }
將json包裝成js
@Controller public class ItemCatController { @Autowired private ItemCatService itemCatService; @RequestMapping(value="/item/all",produces=MediaType.APPLICATION_JSON_VALUE + ";charset=utf-8") @ResponseBody public String getMenu(String callback){ Menu menu = itemCatService.initMenu(); String jsonMenu = JsonUtils.objectToJson(menu); String jsMenu = callback+"("+jsonMenu+")"; return jsMenu; } }
原文鏈接:https://www.cnblogs.com/gaojinshun/p/15400650.html
作者：ki16 出處：https://www.cnblogs.com/gaojinshun/ 本文著作權歸作者和博客園共有，歡迎轉載，但未經作者同意必須在文章頁面給出原文連接，否則保留追究法律責任的權利，轉載請註明出處，本文鏈接：https://www.uj5u.com/houduan/311918.html
標籤：Java
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