fix #124

src/views/tool/library/json/json2Java.js

 const IMPORT_MAP = {'Date': 'java.util.Date', 'List': 'java.util.List'}
 let attrClassAry = [];
-
+import {camelCase} from "camel-case"
 function firstToUpperCase(str) {
     return str.substr(0, 1).toUpperCase() + str.substr(1);
 }
 
-function camelCase(input) {
-    return input.toLowerCase().replace(/_(.)/g, function (match, group1) {
-        return group1.toUpperCase();
-    });
-}
-
 function camelCaseWithFirstCharUpper(input) {
     if (!input) {
         return ""
@@ -139,4 +133,4 @@ export default (json, cls = "JsonRootBean", pag = "pag.json2bean") => {
         beans.push(toBeanText(temp[key], pag));
     }
     return beans.join("\n");
-}
\ No newline at end of file
+}