大家好，又见面了，我是你们的朋友全栈君。
一、JASSONArray转为JSONObject
JSONArray result_type = new JSONArray();
StringBuffer cdsIdxType = new StringBuffer();
cdsIdxType.append(” select id from table_type “);
result_type = jdbcTemp.queryForJSONArray(cdsIdxType.toString());
JSONObject jsonObject = (JSONObject) result_type.get(i);
二、JASONArray转为List
JSONArray result_type = new JSONArray();
StringBuffer cdsIdxType = new StringBuffer();
cdsIdxType.append(” select id from table_type “);
result_type = jdbcTemp.queryForJSONArray(cdsIdxType.toString());
ArrayList list_type = new ArrayList();
for (int i = 0; i < result_type.size(); i++) {
JSONObject jsonObject = (JSONObject) result_type.get(i);
list_type.add(jsonObject.get(“id”));
}
三、JSONArray转为String
JSONArray result_type = new JSONArray();
StringBuffer cdsIdxType = new StringBuffer();
cdsIdxType.append(” select id from table_type “);
result_type = jdbcTemp.queryForJSONArray(cdsIdxType.toString());
String typeAll = “”;
ArrayList list_type = new ArrayList();
for (int i = 0; i < result_type.size(); i++) {
JSONObject jsonObject = (JSONObject) result_type.get(i);
list_type.add(jsonObject.get(“id”));
}
for(int j=0;j<list_type.size();j++){
typeAll = typeAll + “‘” + list_type.get(j) + “‘” + “,”;
}
typeAll = typeAll.substring(0, typeAll.length() -1);
四、String转换为ArrayList
String tablecode = request.getParameter(“tablecode”);
tablecode = tablecode.substring(1, tablecode.length()-1).replace(“\””, “”);
String[] list = tablecode.split(“,”);
ArrayList tables = new ArrayList();
for(int i=0; i<list.length; i++){
tables.add(list[i]);
}
五.String转JSONObject
String jsonMese = “{\”语文\”:\”88\”,\”数学\”:\”78\”,\”计算机\”:\”99\”}”;
JSONObject myJson = JSONObject.fromObject(jsonMese);
六.String转JSONArray
String jsonMessage = “[{‘num’:’成绩’, ‘外语’:88, ‘历史’:65, ‘地理’:99, ‘object’:{‘aaa’:’1111′,’bbb’:’2222′,’cccc’:’3333′}},” + “{‘num’:’兴趣’, ‘外语’:28, ‘历史’:45, ‘地理’:19, ‘object’:{‘aaa’:’11a11′,’bbb’:’2222′,’cccc’:’3333′}},” + “{‘num’:’爱好’, ‘外语’:48, ‘历史’:62, ‘地理’:39, ‘object’:{‘aaa’:’11c11′,’bbb’:’2222′,’cccc’:’3333′}}]”;
JSONArray myJsonArray = JSONArray.fromObject(jsonMessage);
七.String转数组
String string = “a,b,c”; String [] stringArr= string.split(“,”); //注意分隔符是需要转译
如果是”abc”这种字符串,就直接
String string = “abc” ; char [] stringArr = string.toCharArray(); //注意返回值是char数组 如果要返回byte数组就直接使用getBytes方法就ok了
String string = “abc” ; byte [] stringArr = string.getBytes();
八、数组转String
char[] data={a,b,c};
String s=new String(data);
发布者：全栈程序员-站长，转载请注明出处：https://javaforall.net/136697.html原文链接：https://javaforall.net
