Java简单使用get方式调用url接口（java调用接口get请求）

调用天气预报接口举例：

1. 
   
2. package webservice.weather;
4. import com.alibaba.fastjson.JSON;
5. import com.alibaba.fastjson.JSONArray;
6. import com.alibaba.fastjson.JSONObject;
8. import java.net.*;
9. import java.io.*;
11. /**
12. * Created by yangjf on 2017/3/15
13. * Update date:
14. * Time: 23:11
15. * Describle :
16. * Result of Test:
17. * Command:
18. * Email: jifei.yang@ngaa.com.cn
19. */
20. public class WebserviceWeather {
22. public static void main(String args[]) throws Exception {
23. URL u = new URL("http://api.k780.com:88/?app=weather.today&weaid=1&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=json");
24. InputStream in = u.openStream();
25. ByteArrayOutputStream out = new ByteArrayOutputStream();
26. try {
27. byte buf[] = new byte[1024];
28. int read = 0;
29. while ((read = in.read(buf)) > 0) {
30. out.write(buf, 0, read);
31. }
32. } finally {
33. if (in != null) {
34. in.close();
35. }
36. }
37. byte b[] = out.toByteArray();
38. String result=new String(b, "utf-8");
39. System.out.println("返回值："+result);
40. //可以使用fastjson解析
42. JSONObject json=JSONObject.parseObject(result);
43. System.out.println("success:"+json.getString("success"));
45. String obj = json.getString("result");
47. //如果返回多个数据，可以遍历，一般不用遍历
48. ResultWeatherInfo resInfo= JSON.parseObject(obj ,ResultWeatherInfo.class);
49. System.out.println("信息 :"+resInfo);
50. }
52. }
53. class ResultWeatherInfo{
54. private String days;
55. private String week;
56. private String cityno;
57. private String citynm;
58. private String cityid;
59. private String temperature;
60. private String temperature_curr;
61. private String humidity;
62. private String weather_curr;
63. private String weather_icon1;
64. private String wind;
65. public ResultWeatherInfo(){}
66. public ResultWeatherInfo(String days, String week, String cityno, String citynm, String cityid, String temperature, String temperature_curr, String humidity, String weather_curr, String weather_icon1, String wind) {
67. this.days = days;
68. this.week = week;
69. this.cityno = cityno;
70. this.citynm = citynm;
71. this.cityid = cityid;
72. this.temperature = temperature;
73. this.temperature_curr = temperature_curr;
74. this.humidity = humidity;
75. this.weather_curr = weather_curr;
76. this.weather_icon1 = weather_icon1;
77. this.wind = wind;
78. }
80. public String getDays() {
81. return days;
82. }
84. public void setDays(String days) {
85. this.days = days;
86. }
88. public String getWeek() {
89. return week;
90. }
92. public void setWeek(String week) {
93. this.week = week;
94. }
96. public String getCityno() {
97. return cityno;
98. }
100. public void setCityno(String cityno) {
101. this.cityno = cityno;
102. }
104. public String getCitynm() {
105. return citynm;
106. }
108. public void setCitynm(String citynm) {
109. this.citynm = citynm;
110. }
112. public String getCityid() {
113. return cityid;
114. }
116. public void setCityid(String cityid) {
117. this.cityid = cityid;
118. }
120. public String getTemperature() {
121. return temperature;
122. }
124. public void setTemperature(String temperature) {
125. this.temperature = temperature;
126. }
128. public String getTemperature_curr() {
129. return temperature_curr;
130. }
132. public void setTemperature_curr(String temperature_curr) {
133. this.temperature_curr = temperature_curr;
134. }
136. public String getHumidity() {
137. return humidity;
138. }
140. public void setHumidity(String humidity) {
141. this.humidity = humidity;
142. }
144. public String getWeather_curr() {
145. return weather_curr;
146. }
148. public void setWeather_curr(String weather_curr) {
149. this.weather_curr = weather_curr;
150. }
152. public String getWeather_icon1() {
153. return weather_icon1;
154. }
156. public void setWeather_icon1(String weather_icon1) {
157. this.weather_icon1 = weather_icon1;
158. }
160. public String getWind() {
161. return wind;
162. }
164. public void setWind(String wind) {
165. this.wind = wind;
166. }
168. @Override
169. public String toString() {
170. return "ResultWeatherInfo{" +
171. "days='" + days + '\'' +
172. ", week='" + week + '\'' +
173. ", cityno='" + cityno + '\'' +
174. ", citynm='" + citynm + '\'' +
175. ", cityid='" + cityid + '\'' +
176. ", temperature='" + temperature + '\'' +
177. ", temperature_curr='" + temperature_curr + '\'' +
178. ", humidity='" + humidity + '\'' +
179. ", weather_curr='" + weather_curr + '\'' +
180. ", weather_icon1='" + weather_icon1 + '\'' +
181. ", wind='" + wind + '\'' +
182. '}';
183. }
184. }