json的综合使用(一)

来源：互联网发布：淘宝买的东西在哪好评编辑：程序博客网时间：2024/05/18 20:32

<script> //前台的使用方法$(document).ready(function() {  $("#agreed").click(function(){    var id = $("#aid").val();    var bid = $("#abid").val();$.post('/agreedAction.do',function(data,status){   if(status=="success"){            var a = eval(data);            alert(a);               $("#agreed_num")[0].innerHTML=a;}});});       });             </script>//后台的处理方法public String agreedAction() {HttpServletResponse response = ServletActionContext.getResponse();response.setContentType("application/json");response.setCharacterEncoding("utf-8");PrintWriter out = null;try {out = response.getWriter();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}try {//具体的操作处理步骤省略out.write(JsonUtil.objectToJson("45")); //将获得值转换为json的格式out.flush();out.close();} catch (BbscsException e) {e.printStackTrace();}return null;}

工具类jsonUtil:

import java.beans.IntrospectionException;  import java.beans.Introspector;  import java.beans.PropertyDescriptor;  import java.math.BigDecimal;  import java.math.BigInteger;  import java.util.List;  import java.util.Map;  import java.util.Set;    public class JsonUtil {       private static org.apache.commons.logging.Log log = org.apache.commons.logging.LogFactory        .getLog(JsonUtil.class);        public static String object2json(Object obj) {      StringBuilder json = new StringBuilder();      if (obj == null) {        json.append("""");      } else if (obj instanceof String ||         obj instanceof Integer ||         obj instanceof Float  ||         obj instanceof Boolean ||         obj instanceof Short ||         obj instanceof Double ||          obj instanceof Long ||         obj instanceof BigDecimal ||         obj instanceof BigInteger ||          obj instanceof Byte) {        json.append(""").append(string2json(obj.toString())).append(""");      } else if (obj instanceof Object[]) {        json.append(array2json((Object[]) obj));      } else if (obj instanceof List) {        json.append(list2json((List<?>) obj));      } else if (obj instanceof Map) {        json.append(map2json((Map<?, ?>) obj));      } else if (obj instanceof Set) {        json.append(set2json((Set<?>) obj));      } else {        json.append(bean2json(obj));      }      return json.toString();    }        public static String bean2json(Object bean) {      StringBuilder json = new StringBuilder();      json.append("{");      PropertyDescriptor[] props = null;      try {        props = Introspector.getBeanInfo(bean.getClass(), Object.class).getPropertyDescriptors();      } catch (IntrospectionException e) {}      if (props != null) {        for (int i = 0; i < props.length; i++) {          try {            String name = object2json(props[i].getName());            String value = object2json(props[i].getReadMethod().invoke(bean));            json.append(name);            json.append(":");            json.append(value);            json.append(",");          } catch (Exception e) {}        }        json.setCharAt(json.length() - 1, '}');      } else {        json.append("}");      }      return json.toString();    }        public static String list2json(List<?> list) {      StringBuilder json = new StringBuilder();      json.append("[");      if (list != null && list.size() > 0) {        for (Object obj : list) {          json.append(object2json(obj));          json.append(",");        }        json.setCharAt(json.length() - 1, ']');      } else {        json.append("]");      }      return json.toString();    }        public static String array2json(Object[] array) {      StringBuilder json = new StringBuilder();      json.append("[");      if (array != null && array.length > 0) {        for (Object obj : array) {          json.append(object2json(obj));          json.append(",");        }        json.setCharAt(json.length() - 1, ']');      } else {        json.append("]");      }      return json.toString();    }        public static String map2json(Map<?, ?> map) {      StringBuilder json = new StringBuilder();      json.append("{");      if (map != null && map.size() > 0) {        for (Object key : map.keySet()) {          json.append(object2json(key));          json.append(":");          json.append(object2json(map.get(key)));          json.append(",");        }        json.setCharAt(json.length() - 1, '}');      } else {        json.append("}");      }      return json.toString();    }        public static String set2json(Set<?> set) {      StringBuilder json = new StringBuilder();      json.append("[");      if (set != null && set.size() > 0) {        for (Object obj : set) {          json.append(object2json(obj));          json.append(",");        }        json.setCharAt(json.length() - 1, ']');      } else {        json.append("]");      }      return json.toString();    }        public static String string2json(String s) {      if (s == null)        return "";      StringBuilder sb = new StringBuilder();      for (int i = 0; i < s.length(); i++) {        char ch = s.charAt(i);        switch (ch) {        case '"':          sb.append("\"");          break;        case '\':          sb.append("\\");          break;        case 'b':          sb.append("\b");          break;        case 'f':          sb.append("\f");          break;        case 'n':          sb.append("\n");          break;        case 'r':          sb.append("\r");          break;        case 't':          sb.append("\t");          break;        case '/':          sb.append("\/");          break;        default:          if (ch >= 'u0000' && ch <= 'u001F') {            String ss = Integer.toHexString(ch);            sb.append("\u");            for (int k = 0; k < 4 - ss.length(); k++) {              sb.append('0');            }            sb.append(ss.toUpperCase());          } else {            sb.append(ch);          }

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