java中怎么将json数据中的一段提取出来

package bean;

import comgooglegsonannotationsSerializedName;

import javautilList;

public class TestBean

{

private String status;

private Msg msg;

public String getStatus() {

return status;

}

public void setStatus(String status) {

thisstatus = status;

}

public Msg getMsg() {

return msg;

}

public void setMsg(Msg msg) {

thismsg = msg;

}

public class Msg

{

private List<City> city;

public List<City> getCity() {

return city;

}

public void setCity(List<City> city) {

thiscity = city;

}

public class City

{

@SerializedName("@attributes")

private SpecialKey key;//奇怪的key处理

public SpecialKey getKey() {

return key;

}

public void setKey(SpecialKey key) {

thiskey = key;

}

public class SpecialKey

{

private String cityX;

private String cityY;

private String cityname;

private String centername;

private String fontColor;

private String pyName;

private String state1;

private String state2;

private String stateDetailed;

private String tem1;

private String tem2;

private String temLow;

private String windState;

private String windDir;

private String windPower;

private String humidity;

private String url;

public String getCityX() {

return cityX;

}

public void setCityX(String cityX) {

thiscityX = cityX;

}

public String getCityY() {

return cityY;

}

public void setCityY(String cityY) {

thiscityY = cityY;

}

public String getCityname() {

return cityname;

}

public void setCityname(String cityname) {

thiscityname = cityname;

}

public String getCentername() {

return centername;

}

public void setCentername(String centername) {

thiscentername = centername;

}

public String getFontColor() {

return fontColor;

}

public void setFontColor(String fontColor) {

thisfontColor = fontColor;

}

public String getPyName() {

return pyName;

}

public void setPyName(String pyName) {

thispyName = pyName;

}

public String getState1() {

return state1;

}

public void setState1(String state1) {

thisstate1 = state1;

}

public String getState2() {

return state2;

}

public void setState2(String state2) {

thisstate2 = state2;

}

public String getStateDetailed() {

return stateDetailed;

}

public void setStateDetailed(String stateDetailed) {

thisstateDetailed = stateDetailed;

}

public String getTem1() {

return tem1;

}

public void setTem1(String tem1) {

thistem1 = tem1;

}

public String getTem2() {

return tem2;

}

public void setTem2(String tem2) {

thistem2 = tem2;

}

public String getTemLow() {

return temLow;

}

public void setTemLow(String temLow) {

thistemLow = temLow;

}

public String getWindState() {

return windState;

}

public void setWindState(String windState) {

thiswindState = windState;

}

public String getWindDir() {

return windDir;

}

public void setWindDir(String windDir) {

thiswindDir = windDir;

}

public String getWindPower() {

return windPower;

}

public void setWindPower(String windPower) {

thiswindPower = windPower;

}

public String getHumidity() {

return humidity;

}

public void setHumidity(String humidity) {

thishumidity = humidity;

}

public String getUrl() {

return url;

}

public void setUrl(String url) {

thisurl = url;

}

}

}

}

}

可以使用Gson，没有可以去网上下载一个。注意bean文件的对应的类型可以改成你自己数据的类型，其实如果没有算数运算全用String最好，免得返回奇怪的东西报错。关键在于用@SerializedName("@attributes")处理奇怪的key

TestBean bean = new Gson()fromJson(json, TestBeanclass);

List<TestBeanMsgCity> cityList = beangetMsg()getCity();

for (int i = 0; i < cityListsize();i++)

{

if (cityListget(i)getKey()getCityname()equals("福州"))

{

// 这就是你要的那条“福州”的对象了

}

}

其实这样分隔，要不要考虑2个字符串之间除了逗号之外的空白呢？

public class Test {

public static void main(String[] args) {

String str = "zifuchun1,zifuchuan2,zifuchuan3,zifuchuan4";

String[] ary = strsplit(",");//调用API方法按照逗号分隔字符串

for(String item: ary){

Systemoutprintln(item);

}

}

}

----------------

zifuchun1

zifuchuan2

zifuchuan3

zifuchuan4

String str = "\"1\",\"2\",\"3\",\"4\",\"5\",\"6\"";

String regex = "\"[^\"]+[\"\\,\\s]+([^\"]+)";

String result = strreplaceAll(regex, "$1");

Systemoutprintln(result);

importjavaawt;importjavaapplet;importjavaawtevent;publicclassUseTextEventextendsAppletimplementsActionListener,TextListener{TextFieldt1;TextAreat2;Panelp1;publicvoidinit(){t1=newTextField(25);t2=newTextArea(10,25);t1addActionListener(this);t1addTextListener(this);p1=newPanel(newBorderLayout());p1add(t1,BorderLayoutNORTH);p1add(t2,BorderLayoutSOUTH);add(p1);}publicvoidtextValueChanged(TextEventt){if(tgetSource()==t1){t1setText(t1getText());t1setCaretPosition(t1getText()length());//设置输入后的长度t2setText(t1getText());}}publicvoidactionPerformed(ActionEvente){if(egetSource()==t1)t2setText("");}}这个可以使光标放在文字的后面，但是光标还是会闪动，不稳定。

import javautilregexMatcher;

import javautilregexPattern;

public class RecE {

Pattern pattern;

Matcher matcher;

/ ps:

字符类

[abc] a、b 或 c（简单类）

[^abc] 任何字符，除了 a、b 或 c（否定）

[a-zA-Z] a 到 z 或 A 到 Z，两头的字母包括在内（范围）

[a-d[m-p]] a 到 d 或 m 到 p：[a-dm-p]（并集）

[a-z&&[def]] d、e 或 f（交集）

[a-z&&[^bc]] a 到 z，除了 b 和 c：[ad-z]（减去）

[a-z&&[^m-p]] a 到 z，而非 m 到 p：[a-lq-z]（减去）

预定义字符类

任何字符（与行结束符可能匹配也可能不匹配）

\d 数字：[0-9]

\D 非数字： [^0-9]

\s 空白字符：[ \t\n\x0B\f\r]

\S 非空白字符：[^\s]

\w 单词字符：[a-zA-Z_0-9]

\W 非单词字符：[^\w]

/

public void getMatchedPattern(String regx,String source){

pattern = Patterncompile(regx);

matcher = patternmatcher(source);

int index = 1;

while(!matcherhitEnd()){

if(matcherfind()){

Systemoutprintln("找到第"+index +"个"+matchergroup());

index++;

}

}

Systemoutprintln("一共找到"+(index-1)+"组匹配项");

}

public static void main(String[] args) {

new RecE()getMatchedPattern("love","ilove12what i love23e tolove dolove a efe");

}

}

结果：

找到第2个love

找到第3个love

找到第4个love

一共找到4组匹配项

int a[]={0,0,0,1,2,3,0,0};

int i=0;

while(a[i]==0){ //找到最后一个0

i++;

}

Systemoutprintln(i);

int j=0;

int b[]= new int[alength-i]; //用来储存新数组

for(;i<alength;i++){

b[j]=a[i];

Systemoutprint(b[j]);

j++;

}

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