SpringMvc 相关,bean map转换,百度天气,base64.js,jsBase64.java;

1. Map<String, Object>与JavaBean[POJO, Model]转换;

//model
public class model{
    private int id;
    private String name;
    private Date dateNow;
    public int getId() {
        return this.id;
    }
    public void setId(int id) {
        this.id = id;
    }
    //..
}

import org.apache.commons.beanutils.BeanUtils;
import java.util.Date;
//Map<String, Object>;
Map<String, Object> map = new HashMap<String, Object>();
map.put("id", "idxxxxxx");
map.put("name", "name");
map.put("dateNow", new Date());

try {
    BeanUtils.populate(model, map);
} catch (IllegalAccessException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
} catch (InvocationTargetException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

2. 查询百度天气:

@RequestMapping(value = "/weather", method = RequestMethod.GET)
@ResponseBody
public String getWeather(HttpServletRequest request) throws Exception {
        //百度天气API
        
        String cityName = JsBase64.decode(request.getParameter("city"), "Unicode");
        String baiduUrl = "http://api.map.baidu.com/telematics/v3/weather?location="+cityName+"&output=json&ak=DjKh3SLaEXaLMVCaaqaMaG2d";
        StringBuffer strBuf;

        try {                                                       
            baiduUrl = "http://api.map.baidu.com/telematics/v3/weather?location="+URLEncoder.encode(cityName, "utf-8")+"&output=json&ak=DjKh3SLaEXaLMVCaaqaMaG2d";                    
        } catch (UnsupportedEncodingException e1) {                
            e1.printStackTrace();                    
        }

        strBuf = new StringBuffer();
            
        try{
            URL url = new URL(baiduUrl);
            URLConnection conn = url.openConnection();
            BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream(),"utf-8"));//转码。
            String line = null;
            while ((line = reader.readLine()) != null)
                strBuf.append(line + " ");
                reader.close();
        }catch(MalformedURLException e) {
            e.printStackTrace(); 
        }catch(IOException e){
            e.printStackTrace(); 
        }    

        return strBuf.toString();
}

JsBase64.java

package utils;

public class JsBase64 {
    private static final byte[] encodingTable = {

    (byte) 'A', (byte) 'B', (byte) 'C', (byte) 'D', (byte) 'E',

    (byte) 'F', (byte) 'G', (byte) 'H', (byte) 'I', (byte) 'J',

    (byte) 'K', (byte) 'L', (byte) 'M', (byte) 'N', (byte) 'O',

    (byte) 'P', (byte) 'Q', (byte) 'R', (byte) 'S', (byte) 'T',

    (byte) 'U', (byte) 'V', (byte) 'W', (byte) 'X', (byte) 'Y',

    (byte) 'Z', (byte) 'a', (byte) 'b', (byte) 'c', (byte) 'd',

    (byte) 'e', (byte) 'f', (byte) 'g', (byte) 'h', (byte) 'i',

    (byte) 'j', (byte) 'k', (byte) 'l', (byte) 'm', (byte) 'n',

    (byte) 'o', (byte) 'p', (byte) 'q', (byte) 'r', (byte) 's',

    (byte) 't', (byte) 'u', (byte) 'v', (byte) 'w', (byte) 'x',

    (byte) 'y', (byte) 'z', (byte) '0', (byte) '1', (byte) '2',

    (byte) '3', (byte) '4', (byte) '5', (byte) '6', (byte) '7',

    (byte) '8', (byte) '9', (byte) '+', (byte) '/'

    };

    private static final byte[] decodingTable;

    static {

        decodingTable = new byte[128];

        for (int i = 0; i < 128; i++) {

            decodingTable[i] = (byte) -1;

        }

        for (int i = 'A'; i <= 'Z'; i++) {

            decodingTable[i] = (byte) (i - 'A');

        }

        for (int i = 'a'; i <= 'z'; i++) {

            decodingTable[i] = (byte) (i - 'a' + 26);

        }

        for (int i = '0'; i <= '9'; i++) {

            decodingTable[i] = (byte) (i - '0' + 52);

        }

        decodingTable['+'] = 62;

        decodingTable['/'] = 63;

    }

    public static byte[] encode(byte[] data, int offset) {

        byte[] bytes;

        int realCount = data.length - offset;

        int modulus = realCount % 3;

        if (modulus == 0) {

            bytes = new byte[(4 * realCount) / 3];

        } else {

            bytes = new byte[4 * ((realCount / 3) + 1)];

        }

        int dataLength = (data.length - modulus);

        int a1;

        int a2;

        int a3;

        for (int i = offset, j = 0; i < dataLength; i += 3, j += 4) {

            a1 = data[i] & 0xff;

            a2 = data[i + 1] & 0xff;

            a3 = data[i + 2] & 0xff;

            bytes[j] = encodingTable[(a1 >>> 2) & 0x3f];

            bytes[j + 1] = encodingTable[((a1 << 4) | (a2 >>> 4)) & 0x3f];

            bytes[j + 2] = encodingTable[((a2 << 2) | (a3 >>> 6)) & 0x3f];

            bytes[j + 3] = encodingTable[a3 & 0x3f];

        }

        int b1;

        int b2;

        int b3;

        int d1;

        int d2;

        switch (modulus) {

        case 0: /* nothing left to do */

            break;

        case 1:

            d1 = data[data.length - 1] & 0xff;

            b1 = (d1 >>> 2) & 0x3f;

            b2 = (d1 << 4) & 0x3f;

            bytes[bytes.length - 4] = encodingTable[b1];

            bytes[bytes.length - 3] = encodingTable[b2];

            bytes[bytes.length - 2] = (byte) '=';

            bytes[bytes.length - 1] = (byte) '=';

            break;

        case 2:

            d1 = data[data.length - 2] & 0xff;

            d2 = data[data.length - 1] & 0xff;

            b1 = (d1 >>> 2) & 0x3f;

            b2 = ((d1 << 4) | (d2 >>> 4)) & 0x3f;

            b3 = (d2 << 2) & 0x3f;

            bytes[bytes.length - 4] = encodingTable[b1];

            bytes[bytes.length - 3] = encodingTable[b2];

            bytes[bytes.length - 2] = encodingTable[b3];

            bytes[bytes.length - 1] = (byte) '=';

            break;

        }

        return bytes;

    }

    public static byte[] decode(byte[] data) {

        byte[] bytes;

        byte b1;

        byte b2;

        byte b3;

        byte b4;

        data = discardNonBase64Bytes(data);

        if (data[data.length - 2] == '=') {

            bytes = new byte[(((data.length / 4) - 1) * 3) + 1];

        } else if (data[data.length - 1] == '=') {

            bytes = new byte[(((data.length / 4) - 1) * 3) + 2];

        } else {

            bytes = new byte[((data.length / 4) * 3)];

        }

        for (int i = 0, j = 0; i < (data.length - 4); i += 4, j += 3) {

            b1 = decodingTable[data[i]];

            b2 = decodingTable[data[i + 1]];

            b3 = decodingTable[data[i + 2]];

            b4 = decodingTable[data[i + 3]];

            bytes[j] = (byte) ((b1 << 2) | (b2 >> 4));

            bytes[j + 1] = (byte) ((b2 << 4) | (b3 >> 2));

            bytes[j + 2] = (byte) ((b3 << 6) | b4);

        }

        if (data[data.length - 2] == '=') {

            b1 = decodingTable[data[data.length - 4]];

            b2 = decodingTable[data[data.length - 3]];

            bytes[bytes.length - 1] = (byte) ((b1 << 2) | (b2 >> 4));

        } else if (data[data.length - 1] == '=') {

            b1 = decodingTable[data[data.length - 4]];

            b2 = decodingTable[data[data.length - 3]];

            b3 = decodingTable[data[data.length - 2]];

            bytes[bytes.length - 2] = (byte) ((b1 << 2) | (b2 >> 4));

            bytes[bytes.length - 1] = (byte) ((b2 << 4) | (b3 >> 2));

        } else {

            b1 = decodingTable[data[data.length - 4]];

            b2 = decodingTable[data[data.length - 3]];

            b3 = decodingTable[data[data.length - 2]];

            b4 = decodingTable[data[data.length - 1]];

            bytes[bytes.length - 3] = (byte) ((b1 << 2) | (b2 >> 4));

            bytes[bytes.length - 2] = (byte) ((b2 << 4) | (b3 >> 2));

            bytes[bytes.length - 1] = (byte) ((b3 << 6) | b4);

        }

        return bytes;

    }

    public static byte[] decode(String data) {

        byte[] bytes;

        byte b1;

        byte b2;

        byte b3;

        byte b4;

        data = discardNonBase64Chars(data);

        if (data.charAt(data.length() - 2) == '=') {

            bytes = new byte[(((data.length() / 4) - 1) * 3) + 1];

        } else if (data.charAt(data.length() - 1) == '=') {

            bytes = new byte[(((data.length() / 4) - 1) * 3) + 2];

        } else {

            bytes = new byte[((data.length() / 4) * 3)];

        }

        for (int i = 0, j = 0; i < (data.length() - 4); i += 4, j += 3) {

            b1 = decodingTable[data.charAt(i)];

            b2 = decodingTable[data.charAt(i + 1)];

            b3 = decodingTable[data.charAt(i + 2)];

            b4 = decodingTable[data.charAt(i + 3)];

            bytes[j] = (byte) ((b1 << 2) | (b2 >> 4));

            bytes[j + 1] = (byte) ((b2 << 4) | (b3 >> 2));

            bytes[j + 2] = (byte) ((b3 << 6) | b4);

        }

        if (data.charAt(data.length() - 2) == '=') {

            b1 = decodingTable[data.charAt(data.length() - 4)];

            b2 = decodingTable[data.charAt(data.length() - 3)];

            bytes[bytes.length - 1] = (byte) ((b1 << 2) | (b2 >> 4));

        } else if (data.charAt(data.length() - 1) == '=') {

            b1 = decodingTable[data.charAt(data.length() - 4)];

            b2 = decodingTable[data.charAt(data.length() - 3)];

            b3 = decodingTable[data.charAt(data.length() - 2)];

            bytes[bytes.length - 2] = (byte) ((b1 << 2) | (b2 >> 4));

            bytes[bytes.length - 1] = (byte) ((b2 << 4) | (b3 >> 2));

        } else {

            b1 = decodingTable[data.charAt(data.length() - 4)];

            b2 = decodingTable[data.charAt(data.length() - 3)];

            b3 = decodingTable[data.charAt(data.length() - 2)];

            b4 = decodingTable[data.charAt(data.length() - 1)];

            bytes[bytes.length - 3] = (byte) ((b1 << 2) | (b2 >> 4));

            bytes[bytes.length - 2] = (byte) ((b2 << 4) | (b3 >> 2));

            bytes[bytes.length - 1] = (byte) ((b3 << 6) | b4);

        }

        for (int i = 0; i < bytes.length; i++)
            System.out.println("," + bytes[i]);

        return bytes;

    }

    private static byte[] discardNonBase64Bytes(byte[] data) {

        byte[] temp = new byte[data.length];

        int bytesCopied = 0;

        for (int i = 0; i < data.length; i++) {

            if (isValidBase64Byte(data[i])) {

                temp[bytesCopied++] = data[i];

            }

        }

        byte[] newData = new byte[bytesCopied];

        System.arraycopy(temp, 0, newData, 0, bytesCopied);

        return newData;

    }

    private static String discardNonBase64Chars(String data) {

        StringBuffer sb = new StringBuffer();

        int length = data.length();

        for (int i = 0; i < length; i++) {

            if (isValidBase64Byte((byte) (data.charAt(i)))) {

                sb.append(data.charAt(i));

            }

        }

        return sb.toString();

    }

    private static boolean isValidBase64Byte(byte b) {

        if (b == '=') {

            return true;

        } else if ((b < 0) || (b >= 128)) {

            return false;

        } else if (decodingTable[b] == -1) {

            return false;

        }

        return true;

    }

    public static String encode(String data, String charset) throws Exception

    {

        // byte[] result = (data.getBytes("Unicode"));

        if (data == null || data.length() == 0)
            return data;

        int offset = 0;

        // getBytes("unicode")转完后会在前头加上两字节”FE“

        byte[] result = encode(data.getBytes(charset), offset);

        StringBuffer sb = new StringBuffer(result.length);

        for (int i = 0; i < result.length; i++)
            sb.append((char) result[i]);

        return sb.toString();

    }

    public static String decode(String data, String charset) throws Exception

    {

        if (data == null || data.length() == 0)
            return data;

        return new String(JsBase64.decode(data), charset);

    }

    public static void main(String[] args) throws Exception {

        String data = "我们";

        String data1 = encode(data, "Unicode");

        String data2 = decode(data1, "Unicode");

        System.out.println(data);

        System.out.println(data1);

        System.out.println(data2);

    }
}

前端调用:

function getWeather(city) {
    console.log(city);
    console.log(escape(city));
    $.ajax({
        type:'GET',
        dataType : 'json',
        url : '/xxxx/weather.do?city='+encode64(city)+'&e='+Math.random(), //'http://api.map.baidu.com/telematics/v3/weather?location='+city+'&output=json&ak=DjKh3SLaEXaLMVCaaqaMaG2d&jscallback=?',
        success:function(data) {
            console.log(data);
            if (data.results) {
                var todays = data.results[0].weather_data[0];
                var pm25 = data.results[0].pm25;
                
                if (todays) {
                    var weather = todays.weather;
                    var temperature = todays.temperature;
                }
                
                $('#clcx_div .weather').html(weather + ' ' + temperature + ' 空气质量: ' + pm25);
            }
        }
    });
}

base64.js:

var keyStr = "ABCDEFGHIJKLMNOP" +

"QRSTUVWXYZabcdef" +

"ghijklmnopqrstuv" +

"wxyz0123456789+/" +

"=";

function encode64(input) {

    input = unicodetoBytes(input);

    var output = "";

    var chr1, chr2, chr3 = "";

    var enc1, enc2, enc3, enc4 = "";

    var i = 0;

    do {

        chr1 = input[i++];

        chr2 = input[i++];

        chr3 = input[i++];

        enc1 = chr1 >> 2;

        enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);

        enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);

        enc4 = chr3 & 63;

        if (isNaN(chr2)) {

            enc3 = enc4 = 64;

        } else if (isNaN(chr3)) {

            enc4 = 64;

        }

        output = output +

        keyStr.charAt(enc1) +

        keyStr.charAt(enc2) +

        keyStr.charAt(enc3) +

        keyStr.charAt(enc4);

        chr1 = chr2 = chr3 = "";

        enc1 = enc2 = enc3 = enc4 = "";

    } while (i < input.length);

    return output;

}

function decode64(input) {

    var output = "";

    var chr1, chr2, chr3 = "";

    var enc1, enc2, enc3, enc4 = "";

    var i = 0;

    // remove all characters that are not A-Z, a-z, 0-9, +, /, or =

    var base64test = /[^A-Za-z0-9+/=]/g;

    if (base64test.exec(input)) {

        alert("There were invalid base64 characters in the input text.
" +

        "Valid base64 characters are A-Z, a-z, 0-9, '+', '/', and '='
" +

        "Expect errors in decoding.");

    }

    input = input.replace(/[^A-Za-z0-9+/=]/g, "");

    output = new Array();

    do {

        enc1 = keyStr.indexOf(input.charAt(i++));

        enc2 = keyStr.indexOf(input.charAt(i++));

        enc3 = keyStr.indexOf(input.charAt(i++));

        enc4 = keyStr.indexOf(input.charAt(i++));

        chr1 = (enc1 << 2) | (enc2 >> 4);

        chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);

        chr3 = ((enc3 & 3) << 6) | enc4;

        output.push(chr1);

        if (enc3 != 64) {

            output.push(chr2);

        }

        if (enc4 != 64) {

            output.push(chr3);

        }

        chr1 = chr2 = chr3 = "";

        enc1 = enc2 = enc3 = enc4 = "";

    } while (i < input.length);

    return bytesToUnicode(output);

}

function unicodetoBytes(s)

{

    var result = new Array();

    if (s == null || s == "")
        return result;

    result.push(255); // add "FE" to head

    result.push(254);

    for ( var i = 0; i < s.length; i++)

    {

        var c = s.charCodeAt(i).toString(16);

        if (c.length == 1)
            i = "000" + c;

        else if (c.length == 2)
            c = "00" + c;

        else if (c.length == 3)
            c = "0" + c;

        var var1 = parseInt(c.substring(2), 16);

        var var2 = parseInt(c.substring(0, 2), 16);

        result.push(var1);

        result.push(var2);

    }

    return result;

}

function bytesToUnicode(bs)

{

    var result = "";

    var offset = 0;

    if (bs.length >= 2 && bs[0] == 255 && bs[1] == 254)
        offset = 2; // delete "FE"

    for ( var i = offset; i < bs.length; i += 2)

    {

        var code = bs[i] + (bs[i + 1] << 8);

        result += String.fromCharCode(code);

    }

    return result;

}