Javaservlet中Json的结果集
尝试从数据库获取数据并存储在JSON对象中,如下所示:Javaservlet中Json的结果集,java,json,servlets,Java,Json,Servlets,尝试从数据库获取数据并存储在JSON对象中,如下所示: try { JsonObject jsonResponse = new JsonObject(); JsonArray data = new JsonArray(); JsonArray row = new JsonArray(); PrintWriter out = response.getWriter(); Conn
try {
JsonObject jsonResponse = new JsonObject();
JsonArray data = new JsonArray();
JsonArray row = new JsonArray();
PrintWriter out = response.getWriter();
Connection con = OracleDBConnection.getConnection();
String query = "Select * from CUSTOMER_DEMOGRAPHICS";
Statement st = con.createStatement();
ResultSet rSet = st.executeQuery(query);
while (rSet.next())
{
row.add(new JsonPrimitive(rSet.getString("COUNTRY")));
row.add(new JsonPrimitive(rSet.getString("STATE")));
row.add(new JsonPrimitive(rSet.getString("CITY")));
data.add(row);
}
jsonResponse.add("ResponseData", data);
response.setContentType("application/json");
response.setCharacterEncoding("UTF-8");
out.print(jsonResponse);
out.flush();
System.out.println(jsonResponse);
} catch (Exception e) {
e.printStackTrace();
}
}
数据库中的表结构:
COUNTRY STATE CITY
================================
AUSTRALIA VICTORIA MELBOURNE
AUSTRALIA NEW SOUTH SYDNEY
问题是,当我打印json时,它会按如下方式为每行打印两次,而不是一次
{
“响应数据”:
[[“澳大利亚”、“维多利亚”、“墨尔本”、“澳大利亚”、“新南威尔士”、“悉尼”],
[“澳大利亚”、“维多利亚”、“墨尔本”、“澳大利亚”、“新南威尔士”、“悉尼”]]
}
您正在创建一行,并将其添加到数组中两次。线路
JsonArray row = new JsonArray();
应该位于循环内部。不在外部。我认为您应该将此代码添加到while()的开头
row = new JsonArray();