合并和拆分map，合并和拆分list,应用于把表格的两行并排显示
合并两个map:
eg1.
public static void main(String args[])
{
Map
Map
map.put("1",new Integer(1));
map.put("2", new Integer(2));
map1.put("3", new Integer(3));
map1.put("4", new Integer(4));
map.putAll(map1);
System.out.println(map1);
System.out.println(map);
}
结果是：
{3=3, 4=4}
{3=3, 2=2, 1=1, 4=4}
eg2
HashMap map=new HashMap();
map.put("1", "A");
HashMap map1 = new HashMap();
map1.put("2", "B");
map1.put("3", "C");
map.putAll(map1);
System.out.println(map);
打印结果：
{3=C, 2=B, 1=A}
如果是如下：
HashMap map=new HashMap();
map.put("1", "A");
HashMap map1 = new HashMap();
map1.put("2", "B");
map1.put("1", "C");
map.putAll(map1);
System.out.println(map);
打印结果：
{2=B, 1=C}
所以说用putAll就可以合并两个MAP，只不过如果有相同的key那么用后面的覆盖前面的
像下面水位这样的表，循环一排显示两个数据的：原理还是一排显示一个数据，”只不过这个数据里有两个数据“
controller里：
//全部测站点实时数据
@RequestMapping(value = "thereal")
public ModelAndView thereal(
@RequestParam(value = "stcd", required = false, defaultValue = "") String stcd,
@RequestParam(value = "pageIndex", required = false, defaultValue = "0") Integer pageIndex,
@RequestParam(value = "pageSize", required = false, defaultValue = "10") Integer pageSize,
HttpServletRequest request, HttpServletResponse response) throws IOException {
String urlwater="http://192.168.1.15:8080/pingshan-service/data/Query1?sttp=ZZ";
String datawater=result(urlwater);
int indexdaowater=datawater.indexOf("{");
String resultdaowater=datawater.substring(indexdaowater);
String resultdaowater2=resultdaowater.replace(")","");
// 得到一个json对象
JSONObject jsObjwater = JSONObject.fromObject(resultdaowater2);
JSONArray jsonArraywater = jsObjwater.getJSONArray("data");
List
List
List
List
//拆分json并把它分为两个list
for(int i=0;i
Map mapwater3 = new HashMap();
if(i%2==0){//把奇数个归为一类
Map mapwater11 = new HashMap();
String stcd1 = (String) jobj.get("stcd");
String tm1 = (String) jobj.get("tm");
Double z1 = (Double) jobj.get("z");
String stnm1 = (String) jobj.get("stnm");
mapwater11.put("stcd1", stcd1);
mapwater11.put("tm1", tm1);
mapwater11.put("z1", z1);
mapwater11.put("stnm1", stnm1);
listwater1.add(mapwater11);
}else {//把偶数个归为一类
Map mapwater21 = new HashMap();
String stcd2 = (String) jobj.get("stcd");System.out.println(i+"stcd2:"+stcd2);
String tm2 = (String) jobj.get("tm");
Double z2 = (Double) jobj.get("z");
String stnm2 = (String) jobj.get("stnm");
mapwater21.put("stcd2", stcd2);
mapwater21.put("tm2", tm2);
mapwater21.put("z2", z2);
mapwater21.put("stnm2", stnm2);
listwater2.add(mapwater21);
}
}
//判断奇偶，把两个list通过map合并为一个list
if (jsonArraywater.size() % 2 == 0) {//为偶数时
for (int j = 0; j < jsonArraywater.size() / 2; j++) {
Map mapwater = new HashMap();
mapwater.put("stcd1", listwater1.get(j).get("stcd1"));
mapwater.put("tm1", listwater1.get(j).get("tm1"));
mapwater.put("z1", listwater1.get(j).get("z1"));
mapwater.put("stnm1", listwater1.get(j).get("stnm1"));
mapwater.put("stcd2", listwater2.get(j).get("stcd2"));
mapwater.put("tm2", listwater2.get(j).get("tm2"));
mapwater.put("z2", listwater2.get(j).get("z2"));
mapwater.put("stnm2", listwater2.get(j).get("stnm2"));
listwater.add(mapwater);
}
} else {
for (int j = 0; j < (jsonArraywater.size() + 1) / 2; j++) {
if (j < (jsonArraywater.size() - 1) / 2) {//为奇数全部有数据时
Map mapwater = new HashMap();
mapwater.put("stcd1", listwater1.get(j).get("stcd1"));
mapwater.put("tm1", listwater1.get(j).get("tm1"));
mapwater.put("z1", listwater1.get(j).get("z1"));
mapwater.put("stnm1", listwater1.get(j).get("stnm1"));
mapwater.put("stcd2", listwater2.get(j).get("stcd2"));
mapwater.put("tm2", listwater2.get(j).get("tm2"));
mapwater.put("z2", listwater2.get(j).get("z2"));
mapwater.put("stnm2", listwater2.get(j).get("stnm2"));
listwater.add(mapwater);
} else {//最后一对，一个有数据，一个没数据
Map mapwater = new HashMap();
mapwater.put("stcd1", "");
mapwater.put("tm1", "");
mapwater.put("z1", "");
mapwater.put("stnm1", "");
mapwater.put("stcd2",listwater2.get(j).get("stcd2"));
mapwater.put("tm2", listwater2.get(j).get("tm2"));
mapwater.put("z2", listwater2.get(j).get("z2"));
mapwater.put("stnm2",listwater2.get(j).get("stnm2"));
listwater.add(mapwater);
}
}
}
JSONObject jsonwater= new JSONObject();
jsonwater.put("data", listwater);
JSONArray jsonArraywaters = jsonwater.getJSONArray("data");//得到list的形式
String urlrain="http://192.168.1.15:8080/pingshan-service/data/Query1?sttp=PP";
String datarain=result(urlrain);
int indexdaorain=datarain.indexOf("{");
String resultdaorain=datarain.substring(indexdaorain);
String resultdaorain2=resultdaorain.replace(")","");System.out.println("resultdaorain2"+resultdaorain2);
// 得到一个json对象
JSONObject jsObjrain = JSONObject.fromObject(resultdaorain2);
JSONArray jsonArrayrain = jsObjrain.getJSONArray("data");
String urlneilao="http://192.168.1.15:8080/pingshan-service/data/Query1?sttp=NL";
String dataneilao=result(urlneilao);
int indexdaoneilao=dataneilao.indexOf("{");
String resultdaoneilao=dataneilao.substring(indexdaoneilao);
String resultdaoneilao2=resultdaoneilao.replace(")","");
// 得到一个json对象
JSONObject jsObjneilao = JSONObject.fromObject(resultdaoneilao2);
JSONArray jsonArrayneilao = jsObjneilao.getJSONArray("data");
HashMap queryParams = new HashMap();
queryParams.put("water", jsonArraywaters);
queryParams.put("rain", jsonArrayrain);
queryParams.put("neilao", jsonArrayneilao);
return new ModelAndView("thereals", queryParams);
}
//根据接口地址获取数据
public String result(String urls) {
String url = urls;
// 地址对象
URL webUrl = null;
try {
webUrl = new URL(url);
} catch (MalformedURLException e) {
e.printStackTrace();
}
// 建立远程连接
HttpURLConnection conn = null;
try {
conn = (HttpURLConnection) webUrl.openConnection();
} catch (IOException e) {
e.printStackTrace();
}
// 得到输入流
InputStream ins = null;
try {
ins = conn.getInputStream();
} catch (IOException e) {
e.printStackTrace();
}
// 字符读取流
BufferedReader bfr = null;
try {
bfr = new BufferedReader(new InputStreamReader(ins,
"UTF-8"));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
// 使用字符串构造器，将读取的每一行数据拼接起来
StringBuffer sb = new StringBuffer();
String content = null;
try {
while ((content = bfr.readLine()) != null) {
sb.append(content);
}
} catch (IOException e) {
e.printStackTrace();
}
// 关闭字符流
try {
bfr.close();
} catch (IOException e) {
e.printStackTrace();
}
// 释放连接
conn.disconnect();
// 得到返回的字符串
String data = sb.toString();
return data;
}
jsp页面上：
| ${item.stnm1}(${item.stcd1}) | ${item.tm1} | ${item.z1} | //第一排第一列${item.stnm2}(${item.stcd2}) | ${item.tm2} | ${item.z2} | //第一排第二列
部分重要代码：
String urlwater="http://192.168.1.15:8080/pingshan-service/data/Query1?sttp=ZZ";
String datawater=result(urlwater);
int indexdaowater=datawater.indexOf("{");
String resultdaowater=datawater.substring(indexdaowater);
String resultdaowater2=resultdaowater.replace(")","");
// 得到一个json对象
JSONObject jsObjwater = JSONObject.fromObject(resultdaowater2);
JSONArray jsonArraywater = jsObjwater.getJSONArray("data");
List
List
List
List
//拆分json并把它分为两个list
for(int i=0;i
JSONObject jobj = (JSONObject) jsonArraywater.get(i);
Map mapwater3 = new HashMap();
if(i%2==0){//把奇数个归为一类
Map mapwater11 = new HashMap();
String stcd1 = (String) jobj.get("stcd");
String tm1 = (String) jobj.get("tm");
Double z1 = (Double) jobj.get("z");
String stnm1 = (String) jobj.get("stnm");
mapwater11.put("stcd1", stcd1);
mapwater11.put("tm1", tm1);
mapwater11.put("z1", z1);
mapwater11.put("stnm1", stnm1);
listwater1.add(mapwater11);
}else {//把偶数个归为一类
Map mapwater21 = new HashMap();
String stcd2 = (String) jobj.get("stcd");System.out.println(i+"stcd2:"+stcd2);
String tm2 = (String) jobj.get("tm");
Double z2 = (Double) jobj.get("z");
String stnm2 = (String) jobj.get("stnm");
mapwater21.put("stcd2", stcd2);
mapwater21.put("tm2", tm2);
mapwater21.put("z2", z2);
mapwater21.put("stnm2", stnm2);
listwater2.add(mapwater21);
}
}
//判断奇偶，把两个list通过map合并为一个list
if (jsonArraywater.size() % 2 == 0) {//为偶数时
for (int j = 0; j < jsonArraywater.size() / 2; j++) {
Map mapwater = new HashMap();
mapwater.put("stcd1", listwater1.get(j).get("stcd1"));
mapwater.put("tm1", listwater1.get(j).get("tm1"));
mapwater.put("z1", listwater1.get(j).get("z1"));
mapwater.put("stnm1", listwater1.get(j).get("stnm1"));
mapwater.put("stcd2", listwater2.get(j).get("stcd2"));
mapwater.put("tm2", listwater2.get(j).get("tm2"));
mapwater.put("z2", listwater2.get(j).get("z2"));
mapwater.put("stnm2", listwater2.get(j).get("stnm2"));
listwater.add(mapwater);
}
} else {
for (int j = 0; j < (jsonArraywater.size() + 1) / 2; j++) {
if (j < (jsonArraywater.size() - 1) / 2) {//为奇数全部有数据时
Map mapwater = new HashMap();
mapwater.put("stcd1", listwater1.get(j).get("stcd1"));
mapwater.put("tm1", listwater1.get(j).get("tm1"));
mapwater.put("z1", listwater1.get(j).get("z1"));
mapwater.put("stnm1", listwater1.get(j).get("stnm1"));
mapwater.put("stcd2", listwater2.get(j).get("stcd2"));
mapwater.put("tm2", listwater2.get(j).get("tm2"));
mapwater.put("z2", listwater2.get(j).get("z2"));
mapwater.put("stnm2", listwater2.get(j).get("stnm2"));
listwater.add(mapwater);
} else {//最后一对，一个有数据，一个没数据
Map mapwater = new HashMap();
mapwater.put("stcd1", "");
mapwater.put("tm1", "");
mapwater.put("z1", "");
mapwater.put("stnm1", "");
mapwater.put("stcd2",listwater2.get(j).get("stcd2"));
mapwater.put("tm2", listwater2.get(j).get("tm2"));
mapwater.put("z2", listwater2.get(j).get("z2"));
mapwater.put("stnm2",listwater2.get(j).get("stnm2"));
listwater.add(mapwater);
}
}
}
JSONObject jsonwater = new JSONObject();
jsonwater.put("data", listwater);
JSONArray jsonArraywaters = jsonwater.getJSONArray("data");//得到list的形式
queryParams.put("water", jsonArraywaters);
还有一种重要的循环请参考：http://blog.csdn.net/qq_23145857/article/details/51658410