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List<Map<String,String>>
StringBuilder sb = new StringBuilder();
sb.append("{");
for(Map<String,String> map:list){
for (String key : map.keySet()) {
sb.append("\"").append(key).append("\":\"").append(map.get(key))
.append("\"").append(",");
}
}
sb.deleteCharAt(sb.lastIndexOf(","));
sb.append("}");